Detailed Information

Research Field/Keywords for Research Field

• Condensed matter physics

Education

• 1996/03, Graduated
• 1998/03, Master Course, Completed
• 2003/01, Doctor Course, Completed

Employment Experience

• 2001/04 - 2003/09 Postdoctoral Fellowships of Japan Society for the Promotion of Science
• 2003/10 - 2007/03 Research Associate, Synchrotron Light Application Center, Saga University
• 2007/04 - 2009/07 Assistant Professor, Synchrotron Light Application Center, Saga University
• 2009/07 -  *  Associate Professor, Synchrotron Light Application Center, Saga University

Field of Specialization

• Condensed matter physics I, Condensed matter physics II, Quantum beam science

Membership in Academic Societies

• The Physical Society of Japan, The Japanese Society for Synchrotron Radiation Research

Themes for Ongoing Research

• Photo-induced phase transitions studied by time-resolved photoemission spectroscopy
• Photo-excited electron dynamics on semiconductor surfaces studied by time-resolved photoemission spectroscopy
• Development of time-resolved photoemission spectrometer using ultrafast laser
• Development of transient absorption spectrometer using synchrotron radiation and laser
• Multistability of the photo-exited states in quasi-1D insulator C5H10NH2PbBr3

Research Themes in the Past

• Development of transient absorption spectrometer using synchrotron radiation and laser
• Multistability of the photo-exited states in quasi-1D insulator C5H10NH2PbBr3

Research Topics and Results

• Electronic band structures of Magneli phase Ti4O7 studied by angle-resolved photoemission spectroscopy 2022/09
• Electronic structure of surface conduction band of Ge(001)-c(4x2) and Ge(111)-c(2x8) surfaces studied by two-photon photoelectron spectroscopy 2016/10
• Occupied and unoccupied electronic structures of an L-cysteine film studied by absorption and resonant photoelectron spectroscopies 2016/04
• Dynamics of surface photo-voltage in GaAs systems studied with time-resolved photoelectron spectroscopy 2016/02
• Linear Dichroism of Topological Surface State Studied by Angle-Resolved Multi-Photon Photoemission Spectroscopy 2015/11
• Unoccupied Electronic Structures of Bi2Te3(111) Studied by Angle-Resolved Multi-Photoemission Spectroscopy 2015/09
• Photo-induced valence change of the sulfur atom in an L-cysteine thin film grown on a silver metal substrate in a saliva-emulated aqueous solution 2015/05
• Photo-induced insulator-metal transition in Ti4O7 studied by time-resolved photoemission measurement 2015/05
• Image Potential States of Bi2Te3(111) Studied by Time-Resolved 2-Photon Photoemission Spectroscopy 2015/05
• Photoelectron Spectroscopic Study on Decay Processes of Core-Excited States of NaNO2 2015/03
• Photo-induced Valence Change of the L-cysteine/Ag Grown in the Aqueous Solution 2014/08
• Occupied and Unoccupied Electronic States of Au(111) Studied by Combined Use of AR1PPE and AR2PPE 2014/08
• Photo-excited Carrier Dynamics of Topological Insulator Bi2Te3 Studied by Time- and Angle-resolved Two-photon Photoemission Spectroscopy 2014/08
• レーザーとシンクロトロン光を利用した時間分解光電子分光システムの開発 2013/09
• Topological Phase Transitions Driven by Magnetic Phase Transitions in FexBi2Te3 (0≤x≤0.1) Single Crystals 2013/04
• Photostimulated detection of defect formation in BaF2 under irradiation of synchrotron radiation 2013/02
• Unoccupied band dispersion of Si(111):√3×√3-Ag surface studied by time- and angle-resolved two-photon photoemission spectroscopy 2012/12
• Time-Resolved Photoemission Measurements Using Synchrotron Radiation and Laser 2012/11
• Photo-induced insulator-metal transition in magneli-phase Ti4O7 studied by time-resolved photoemission measurement 2012/09
• Upgrade of Saga-university beamline in SAGA-LS 2012/07
• Electronic States on Bi2Te3 Studied by Angle-Resolved Photoelectron Spectroscopy Using Synchrotron Radiation 2012/04
• Performance of Saga-University Beamline with Planer Undulator 2010/07
• Direct observation of the dispersion and relaxation of photo-excited electrons in InAs 2010/03
• Dynamics of photo-excited carriers on GaAs(100) surface studied by ultrafast time-resolved photoemission 2009/01
• Ultrafast Time Dependence of Surface Photo-Voltage Effect on p-type GaAs(100) Surface 2008/01
• Ultrafast Decay of Surface Photo-Voltage Effect on n-type GaAs(100) Surface 2007
• Development of the Experimental System for Time- and Angle-resolved Photoemission Spectroscopy 2007
• Infrared absorption change in single-walled carbon nanotubes observed by combination spectroscopy of synchrotron radiation and laser 2006/11
• Development of the Ultrafast Time-Resolved Photoelectron Spectroscopy 2005/02
• Time-resolved photoemission micro-spectrometer using higher-order harmonics of Ti:sapphire laser 2005
• Time-resolved study of Auger-free luminescence in two-photon excited BaF2 with use of synchrotron radiation and laser 2005
• Two-Photon Spectroscopy of Core Excitons in Barium Fluoride Using Synchrotron Radiation and Laser Light 2005
• Laser-induced infrared absorption in lead tungstate observed by laser-SR combined spectroscopy 2005

Original Articles

• Two-dimensional band dispersion of ultraflat hexagonal bismuthene grown on Ag(111) bulk and quantum-well films;　2023/10
  ANNOUNCEMENT INFO.;　Physical Review B, 108, 16, L161407
  AUTHOR;　Kazutoshi Takahashi, Masaki Imamura, Haruto Ikeda, Ryosuke Koyama, Isamu Yamamoto, and Junpei Azuma
  
• Optical film-thinning of graphene epitaxially grown on 4H-SiC(0001): robustness of monolayer-graphene against the photoexcitation;　2023/03
  ANNOUNCEMENT INFO.;　Journal of Physics: Condensed Matter, 35, 195401
  AUTHOR;　Ryosuke Horie, Ryuichi Hirosue, Jun’ichi Kanasaki, Kenji Kisoda, Isamu Yamamoto, Junpei Azuma and Kazutoshi Takahashi
  
• Angle-resolved photoemission measurement along the van-der-Waals stacking direction of ZrTe3;　2022/08
  ANNOUNCEMENT INFO.;　Journal of the Physical Society of Japan, 91, 094708
  AUTHOR;　Makoto Maki, Yuji Fujimoto, Isamu Yamamoto, Junpei Azuma, Sora Kobayashi, Satoshi Demura, Hideaki Sakata
  
• Variation in zinc phthalocyanine molecular orientation on SrTiO3(100) surface;　2022/08
  ANNOUNCEMENT INFO.;　Surface Science, 726, 122162
  AUTHOR;　Isamu Yamamoto, Masaki Imamura, Junpei Azuma, Kazutoshi Takahashi
  
• Thickness dependent band structure of α-bismuthine grown on epitaxial graphene;　2022/04
  ANNOUNCEMENT INFO.;　J. Phys. Cond. Matter, 34, 235502
  AUTHOR;　Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, and Junpei Azuma
  
• Photoinduced intragap excitations in the incommensurate charge density wave phase of Rb0.3MoO3;　2021/07
  ANNOUNCEMENT INFO.;　Physics Letters A
  AUTHOR;　Makoto Maki, Kazuki Matsuo, Emi Koga, Isamu Yamamoto, Junpei Azuma
  
• Structural analyses of Gd3(Al,Ga)5O12 garnet solid solutions via X-ray and UV absorption spectroscopy experiments for Gd atoms;　2021/03
  ANNOUNCEMENT INFO.;　Journal of Alloys and Compounds, 867, 159055_1-159055_7
  AUTHOR;　Mamoru Kitaura, Kei Kamada, Toshiaki Ina, Hisanori Yamane, Manabu Ishizaki, Shinta Watanabe, Junpei Azuma, Isamu Yamamoto, Akimasa Ohnishi, Takeshi Usuki
  
• One dimensionality of the spin-polarized surface conduction and valence bands on Bi/GaSb(110)-(2x1);　2020/06
  ANNOUNCEMENT INFO.;　Phys. Rev. B, 101, 235306
  AUTHOR;　Yoshiyuki Ohtsubo, Naoki Tokumasu, Hiroshi Watanabe,Takuto Nakamura, Patrick Le Fevre, Francois Bertran, Masaki Imamura, Isamu Yamamoto, Junpei Azuma, Kazutoshi Takahashi, and Shin-ichi Kimura
  
• Self-organized formation of chemical bonding in misfit-layered bismuth-based cobaltites;　2019/03
  ANNOUNCEMENT INFO.;　Journal of Electron Spectroscopy and Related Phenomena, 232, 95-99
  AUTHOR;　Makoto Maki, Sho-ichi Takakura, Isamu Yamamoto, Junpei Azuma
  
• Circular dichroism in angle-resolved photoemission mapping of surface state on Bi(111);　2019/01
  ANNOUNCEMENT INFO.;　AIP Conference Proceedings, 2054, 040011_1-040011_5
  AUTHOR;　Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, and Junpei Azuma
  
• Electronic structure of the surface unoccupied band of Ge(001)-c(4x2): Direct imaging of surface electron relaxation pathways;　2017/09
  ANNOUNCEMENT INFO.;　Phys. Rev. B, 96, 115301-1~115301-7
  AUTHOR;　J. Kanasaki, I. Yamamoto, J. Azuma and S. Fukatsu
  
• Interlayer coupling and electronic structure of misfit-layered bismuth-based cobaltites;　2017/06
  ANNOUNCEMENT INFO.;　Phys. Rev. B, 95, 195166-1～195166-5
  AUTHOR;　Sho-ichi Takakura, Isamu Yamamoto, Eishi Tanaka, Junpei Azuma, and Makoto Maki
  
• Energy location of Ce3+ 4f level and majority carrier type in Gd3Al2Ga3O12:Ce crystals studied by surface photovoltage spectroscopy;　2017/06
  ANNOUNCEMENT INFO.;　Appl. Phys. Lett., 110, 251101-1～251101-4
  AUTHOR;　Mamoru Kitaura, Junpei Azuma, Manabu Ishizaki, Kei Kamada, Shunsuke Kurosawa, Shinta Watanabe, Akimasa Ohnishi, and Kazuhiko Hara
  
• Optical absorption and electric resistivity of an L-cysteine film;　2016/11
  ANNOUNCEMENT INFO.;　Journal of the Physical Society of Japan, 85, 124713-1～124713-4
  AUTHOR;　Masao Kamada, Takuya Hideshima, Junpei Azuma, Isamu Yamamoto, Masaki Imamura, and Kazutoshi Takahashi
  
• Probing shallow electron traps in cerium doped Gd3Al2Ga3O12 scintillators by UV-induced absorption spectroscopy;　2016/06
  ANNOUNCEMENT INFO.;　Applied Physics Express
  AUTHOR;　M. Kitaura, K, Kamada, S. Kurosawa, J. Azuma, A. Ohnishi, A. Yamaji, K. Hara
  
• Occupied and unoccupied electronic structures of an L-cysteine film studied by absorption and resonant photoelectron spectroscopies;　2016/04
  ANNOUNCEMENT INFO.;　Journal of Applied Physics, 6, 045306
  AUTHOR;　M. KAMADA, T. HIDESHIMA, J. AZUMA, I. YAMAMOTO, M. IMAMURA, and K. TAKAHASHI
  
• Temperature-dependent Fermi surface of misfit cobaltite [Bi2Sr2O4]0:51CoO2: A comparison with [Bi2Ba2O4]0:50CoO2;　2016/03
  ANNOUNCEMENT INFO.;　Physical Review B, 93, 165118
  AUTHOR;　Sho-ichi Takakura, Isamu Yamamoto, Emi Koga, Fusao Ichikawa, Junpei Azuma, and Makoto Maki
  
• Dynamics of surface photo-voltage in GaAs systems studied with time-resolved photoelectron spectroscopy;　2016/02
  ANNOUNCEMENT INFO.;　Journal of Energy Challenges and Mechanics, 3, 1, 35-41
  AUTHOR;　Masao Kamada, Junpei Azuma, Senku Tanaka and Kazutoshi Takahashi
  
• Impurity-Induced First-order Phase Transitions in Highly Crystalline V2O3 Nanocrystals;　2015/08
  ANNOUNCEMENT INFO.;　Advanced Materials Interfaces, 2, 1500132
  AUTHOR;　Y. Ishiwata, E. Takahashi, K. Akashi, M. Imamura, J. Azuma, K. Takahashi, M. Kamada, H. Ishii, Y.-F. Liao, Y. Tezuka, Y. Inagaki, T. Kawae, D. Nishio-Hamane, M. Nantoh, K. Ishibashi , T. Kida
  
• Photo-induced valence change of the sulfur atom in an L-cysteine thin film grown on a silver metal substrate in a saliva-emulated aqueous solution;　2015/05
  ANNOUNCEMENT INFO.;　Appl. Phys. Lett., 106, 173702
  AUTHOR;　Toru Tsujibayashi, Junpei Azuma, Isamu Yamamoto, Kazutoshi Takahashi, and Masao Kamada
  
• Photoelectron Spectroscopic Study on Decay Processes of Core-Excited States of NaNO2;　2015/03
  ANNOUNCEMENT INFO.;　J. Phys. Soc. Jpn., 84, 054707
  AUTHOR;　M. Kamada, J. Azuma, Y. Ueda, I. Yamamoto, M. Imamura, K. Takahashi
  
• Anomalous photoelectric emission from Ag on a zinc-phthalocyanine film;　2014/05
  ANNOUNCEMENT INFO.;　Appl. Phys Lett., 104, 193304
  AUTHOR;　S. Tanaka, T. Otani, K. Fukuzawa, I. Hiromitsu, K. Ogawa, J. Azuma, I. Yamamoto, K. Takahashi, and M. Kamada
  
• Image potential states on monolayer, bilayer and trilayer epitaxial graphene studied by time- and angle-resolved two-photon photoemission spectroscopy;　2014/04
  ANNOUNCEMENT INFO.;　Phys. Rev. B, 89, 15, 155303
  AUTHOR;　Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, Junpei Azuma, and Masao Kamada
  
• Topological Phase Transitions Driven by Magnetic Phase Transitions in FexBi2Te3 (0≤x≤0.1) Single Crystals;　2013/04
  ANNOUNCEMENT INFO.;　Phys. Rev. Lett., 110, 136601
  AUTHOR;　Heon-Jung Kim, Ki-Seok Kim, J.-F. Wang, V. A. Kulbachinskii, K. Ogawa, M. Sasaki, A. Ohnishi, M. Kitaura, Y.-Y. Wu, L. Li, I. Yamamoto, J. Azuma, M. Kamada, and V. Dobrosavljević
  
• Electronic structure of the L-cysteine films on dental alloys studied by ultraviolet photoelectron spectroscopy;　2013/03
  ANNOUNCEMENT INFO.;　Journal of Physics: Conference Series, 417, 012057
  AUTHOR;　Koji Ogawa, Toru Tsujibayashi, Kazutoshi Takahashi, Junpei Azuma, Masayoshi Ichimiya, Hitoshi Fujimoto, Michinori Sumimoto, and Masao Kamada
  
• Photostimulated detection of defect formation in BaF2 under irradiation of synchrotron radiation;　2013/02
  ANNOUNCEMENT INFO.;　Phys. Status Solidi B, 250, 396-401
  AUTHOR;　Masayuki Watanabe, Junpei Azuma, Shuji Asaka, Toru Tsujibayashi, Osamu Arimoto, Shunsuke Nakanishi, Hiroshi Itoh, and Masao Kamada
  
• Electronic structures in unoccupied states of thin Bi film studied with two-photon photoemission spectroscopy;　2013/02
  ANNOUNCEMENT INFO.;　Appl. Surf. Sci., 267, 66-69
  AUTHOR;　M. Imamura, S. Fujimasa, K. Takahashi, I. Yamamoto, J. Azuma, M .Kamada
  
• Time-resolved two-photon photoemission study of silicon surface at initial stage of oxidation;　2013/02
  ANNOUNCEMENT INFO.;　Appl. Surf. Sci., 267, 154-158
  AUTHOR;　K. Takahashi, K. Ishibashi, Y. Kurahashi, M. Imamura, J. Azuma, M. Kamada
  
• Unoccupied band dispersion of Si(111):√3×√3-Ag surface studied by time- and angle-resolved two-photon photoemission spectroscopy;　2012/12
  ANNOUNCEMENT INFO.;　Journal of Electron Spectroscopy and Related Phenomena, 185, 547-551
  AUTHOR;　Kazutoshi Takahashi, Junpei Azuma, and Masao Kamada
  
• Photoelectron spectroscopic study on the interaction of L-cysteine with the silver-based dental alloy;　2012/07
  ANNOUNCEMENT INFO.;　J. Appl. Phys., 112, 023715
  AUTHOR;　Koji Ogawa, Toru Tsujibayashi , Kazutoshi Takahashi , Junpei Azuma , Masao Kamada
  
• Surface electronic structure of Bi2Te3(111) studied by high-resolution photoelectron spectroscopy using synchrotron radiation;　2012/04
  ANNOUNCEMENT INFO.;　Phys. Rev. B, 85, 165431
  AUTHOR;　Koji Ogawa, Junpei Azuma, Kazutoshi Takahashi, Masao Kamada, Minoru Sasaki, Akimasa Ohnishi, Mamoru Kitaura, and Heon-Jung Kim
  
• Electronic States on Bi2Te3 Studied by Angle-Resolved Photoelectron Spectroscopy Using Synchrotron Radiation;　2012/04
  ANNOUNCEMENT INFO.;　e-J. Surf. Sci. Nanotech., 10, 117-120
  AUTHOR;　Koji Ogawa, Junpei Azuma, Kazutoshi Takahashi, Masao Kamada, Minoru Sasaki, Akimasa Ohnishi, Mamoru Kitaura, and Heon-Jung Kim
  
• Two-dimensional band dispersion and momentum-resolved lifetime of image-potential state on graphite studied by angle-resolved multi-photon photoemission spectroscopy;　2012/02
  ANNOUNCEMENT INFO.;　Phys. Rev. B., 85, 7, 075325
  AUTHOR;　Kazutoshi Takahashi, Junpei Azuma, and Masao Kamada
  
• Surface Photo-Voltage Effect on Cr/GaAs(100) Studied by Photoemission Spectroscopy with the Combination of Synchrotron Radiation and Laser;　2011/12
  ANNOUNCEMENT INFO.;　J. Appl. Phys., 110, 113711
  AUTHOR;　Kazutoshi Takahashi, Shinji Tokudomi , Yusuke Nagata , Junpei Azuma , Masao Kamada
  
• The observation of unoccupied quantum-well states in Bi thin film grown on Si(111) by two-photon photoemission spectroscopy;　2011/12
  ANNOUNCEMENT INFO.;　Appl. Phys. Lett., 99, 243101
  AUTHOR;　Shuji Fujimasa, Masaki Imamura, Kazutoshi Takahashi, Isamu Yamamoto, Junpei Azuma, Masao Kamada
  
• Photoelectron spectroscopic study on the electronic structures of the dental gold alloys and their interaction with L-cysteine;　2011/11
  ANNOUNCEMENT INFO.;　J. Appl. Phys., 110, 103718
  AUTHOR;　Koji Ogawa, Toru Tsujibayashi, Kazutoshi Takahashi, Junpei Azuma, Masayoshi Ichimiya, Hitoshi Fujimoto, Michinori Sumimoto, Masao Kamada
  
• Valence electronic states of p-type β-FeSi2 single crystal studied by high-resolution and resonant photoelectron spectroscopy;　2011/07
  ANNOUNCEMENT INFO.;　Appl. Phys. Lett., 99, 022107
  AUTHOR;　Koji Ogawa, Minoru Sasaki, Akimasa Ohnishi, Mamoru Kitaura, Hitoshi Fujimoto, Junpei Azuma, Kazutoshi Takahashi, and Masao Kamada
  
• A study of an electron affinity of cesium telluride thin film;　2011/06
  ANNOUNCEMENT INFO.;　J. Phys.: Conf. Ser., 289, 012014
  AUTHOR;　H Sugiyama, K Ogawa, J Azuma, K Takahashi, M Kamada, T Nishitani, M Tabuchi, T. Motoki, K. Takashima, A. Era and Y. Takeda
  
• Photoemission study on the valence band of a β-FeSi2 thin film using synchrotron radiation;　2011/05
  ANNOUNCEMENT INFO.;　Dalton Trans., 40, 6023-6027
  AUTHOR;　Hitoshi Fujimoto, Koji Ogawa, Kenichi Takarabe, Haruhiko Udono, Harue Sugiyama, Junpei Azuma, Kazutoshi Takahashi, and Masao Kamada
  
• Excited electronic state on Si(001) surface at initial stage of oxidation studied by two-photon photoemission spectroscopy;　2011/04
  ANNOUNCEMENT INFO.;　Journal of Electron Spectroscopy and Related Phenomena, 184, 304-308
  AUTHOR;　Kazutoshi Takahashi, Yusuke Kurahashi, Takeshi Koga, Junpei Azuma, Masao Kamada
  
• Electronic structures of the L-cysteine film on dental alloys;　2011/04
  ANNOUNCEMENT INFO.;　Journal of Electron Spectroscopy and Related Phenomena, 184, 327-330
  AUTHOR;　K. Ogawa, T. Tsujibayashi, K. Takahashi, J. Azuma, K. Kakimoto, M. Kamada
  
• Valence electronic structure of β-FeSi2 single crystal investigated by photoelectron spectroscopy using synchrotron radiation;　2011/02
  ANNOUNCEMENT INFO.;　Physics Procedia, 11, 63-66
  AUTHOR;　K. Ogawa, M. Sasaki, A. Ohnishi, M. Kitaura, H. Fujimoto, J. Azuma, K. Takahashi and M. Kamada
  
• Adaptation of UVSOR-Type Plane-Grating Monochromator in Saga;　2010/07
  ANNOUNCEMENT INFO.;　AIP Conference Proceedings, 1234, 685-688
  AUTHOR;　H. Sugiyama, K. Takahashi, K. Ogawa, J. Azuma, and M. Kamada
  
• Performance of Saga-University Beamline with Planer Undulator;　2010/07
  ANNOUNCEMENT INFO.;　AIP Conference Proceedings, 1234, 351-354
  AUTHOR;　J. Azuma, K. Takahashi, M. Kamada, H. Ohkuma, and S. Yamamoto
  
• Direct observation of the dispersion and relaxation of photo-excited electrons in InAs;　2010/03
  ANNOUNCEMENT INFO.;　Phys. Rev. B, 81, 11, 113203
  AUTHOR;　J. Azuma, K. Takahashi and M. Kamada
  
• Photoelectron Spectroscopic Study of Electronic Structures in L-Cysteine;　2010/03
  ANNOUNCEMENT INFO.;　J. Phys. Soc. Jpn., 79, 3, 034709
  AUTHOR;　M. Kamada, H. Sugiyama, K. Takahashi, J. Azuma, S. Kitajima, K. Ogawa, M. Sumimoto, K. Hori, and H. Fujimoto
  
• Dynamics of photo-excited carriers on GaAs(100) surface studied by ultrafast time-resolved photoemission;　2009/01
  ANNOUNCEMENT INFO.;　Phys. Stat. Sol. (c), 6, 1, 307-310
  AUTHOR;　J. Azuma, S. Tokudomi, K. Takahashi and M. Kamada
  
• Photostimulated detection of radiation defects produced by VUV light in BaF2;　2009
  ANNOUNCEMENT INFO.;　Radiation Measurements, 1-3
  AUTHOR;　O. Arimoto, M. Watanabe, T. Tsujibayashi, J. Azuma, M. Kamada, S. Nakanishi, H. Itoh and M. Itoh
  
• Ultrafast Time Dependence of Surface Photo-Voltage Effect on p-type GaAs(100) Surface;　2008/01
  ANNOUNCEMENT INFO.;　Journal of Physical Society Japan, 77
  AUTHOR;　S. Tokudomi, J. Azuma, K. Takahashi and M. Kamada
  
• Ultrafast Decay of Surface Photo-Voltage Effect on n-type GaAs(100) Surface;　2007
  ANNOUNCEMENT INFO.;　, 76
  AUTHOR;　S. Tokudomi, J. Azuma, K. Takahashi and M. Kamada
  
• Development of the Experimental System for Time- and Angle-resolved Photoemission Spectroscopy;　2007
  ANNOUNCEMENT INFO.;　AIP series of conference proceedings, 879, 1218
  AUTHOR;　K. Takahashi, J. Azuma, S. Tokudomi and M. Kamada
  
• Core exciton migration in Rb0.82Cs0.18Cl under excitation with synchrotron radiation and laser light;　2007
  ANNOUNCEMENT INFO.;　Journal of Luminescence, 122
  AUTHOR;　T. Tsujibayashi, J. Azuma, Y. Inabe, K. Toyoda, M. Kamada and M. Itoh
  
• Infrared absorption change in single-walled carbon nanotubes observed by combination spectroscopy of synchrotron radiation and laser;　2006/11
  ANNOUNCEMENT INFO.;　Journal of Synchrotron Radiation, 13
  AUTHOR;　J. Azuma, M. Itoh, M. Koike, M. Kamada and M. Endo
  
• Beamline for high-resolution angle-resolved photoemission at Saga Light Source;　2005
  ANNOUNCEMENT INFO.;　Journal of Electron Spectroscopy and Related Phenomena, 144
  AUTHOR;　K. Takahashi, Y. Kondo, J. Azuma and M. Kamada
  
• Time-resolved study of Auger-free luminescence in two-photon excited BaF2 with use of synchrotron radiation and laser;　2005
  ANNOUNCEMENT INFO.;　phys. stat. sol. (c), 2
  AUTHOR;　T. Tsujibayashi, M. Itoh, J. Azuma, M. Watanabe, O. Arimoto, K. Toyoda, S. Nakanishi, H. Itoh and M. Kamada
  
• Two-Photon Spectroscopy of Core Excitons in Barium Fluoride Using Synchrotron Radiation and Laser Light;　2005
  ANNOUNCEMENT INFO.;　Phys. Rev. Lett., 94
  AUTHOR;　T. Tsujibayashi, M. Itoh, J. Azuma, M. Watanabe, O. Arimoto, S. Nakanishi, H. Itoh and M. Kamada
  
• Pump and Probe Spectroscopy using SR and Laser;　2005
  ANNOUNCEMENT INFO.;　Proceedings of International Conference VUVS 2005
  AUTHOR;　M. Kamada, J. Azuma, S. Tokudomi, S. Tanaka and K. Takahashi
  
• Laser-induced infrared absorption in lead tungstate observed by laser-SR combined spectroscopy;　2005
  ANNOUNCEMENT INFO.;　Journal of Luminescence, 119
  AUTHOR;　M. Itoh, J. Azuma, T. Shimizu, M. Kamada, M. Kobayashi and Y. Usuki
  
• Surface photovoltage effect and its time dependence in GaAs-GaAsP superlattice studied with combination of synchrotron and laser radiatio;　2004
  ANNOUNCEMENT INFO.;　JOURNAL OF APPLIED PHYSICS, 95, 2
  AUTHOR;　Tanaka, S / Nishitani, T / Nakanishi, T / More, S. D. / Azuma, J / Takahashi, K / Watanabe, O / Kamada, M
  
• Design of Grazing Incident Monochromator for Saga Synchrotron Light;　2003/07
  ANNOUNCEMENT INFO.;　AIP Conference Proceedings, 705
  AUTHOR;　Y. Kondo, J. Azuma K. Takahashi and M. Kamada
  
• Time-resolved photoemission system in nano- and micro-second region using SR and laser;　2003/07
  ANNOUNCEMENT INFO.;　AIP Conference Proceedings, 705
  AUTHOR;　K. Takahashi, S. Tanaka, J. Azuma and M. Kamada
  

Material, Commentary, Editorials, Research Report, A Comprehensive Journal Articles

• 放射光とレーザーの組み合わせによる新しい分光法;　2003
  ANNOUNCEMENT INFO.;　, 34
  AUTHOR;　
  

General Lectures

• Time-resolved photoemission study of photo-excited carrier dynamics in zinc phthalocyanine thin films grown on HOPG substrate;　2024/03
  ANNOUNCEMENT INFO.;　NanospecFY2023 Frontier of Nano- & Atomic-scale Characterization, 2024.3.4-5, Okazaki
  AUTHOR;　Isamu Yamamoto, Azuma Junpei, Masaki Imamura, Kazutoshi Takahashi
  
• High resolution analysis of hole subband probed by AR2PPE;　2024/02
  ANNOUNCEMENT INFO.;　
  AUTHOR;　Tomohiro Sakata, Sakura N Takeda, Isamu Yamamoto, Junpei Azuma, Taichi Ono, Rima Horie, Hayato Okumura, Ryota Ichikawa, Keiichi Yamada, Hiroaki Miyata
  
• Electronic band structure of ultraflat hexagonal bismuthene;　2024/02
  ANNOUNCEMENT INFO.;　International Symposium on Quantum Electronics (TSQS2024) 2024.2.13-16, Tokyo
  AUTHOR;　M. Imamura, H. Ikeda, R. Koyama, I. Yamamoto, J. Azuma, and K. Takahashi
  
• Surface Atomic Structure and Valence Band Structure of Bulk SiGe Single Crystals;　2023/12
  ANNOUNCEMENT INFO.;　The 3rd Materials Research Meeting (MRM 2023) The 24th IUMRS-International Conference in Asia (IUMRS-ICA 2023), Kyoto International Conference Center, Japan, 2023.12.11-16
  AUTHOR;　Kazutoshi Takahashi, Masaki Imamura, Yuuki Umeda, Isamu Yamamoto, Junpei Azuma, Marina Takaira, Yoshihumi Ikoma, Yasutomo Arai
  
• Status of Saga University Beamline;　2023/10
  ANNOUNCEMENT INFO.;　60 years of Synchrotron Radiation in Japan (JPSR60), Okazaki 2023.10.24-25
  AUTHOR;　Kazutoshi Takahashi, Junpei Azuma, Masaki Imamura, Isamu Yamamoto, Deng Gaofeng, Katsuhiko Saito, and Qixin Guo
  
• Angle-resolved photoemission study of ultra-flat bismuthene grown on Ag(111);　2023/10
  ANNOUNCEMENT INFO.;　Annual Meeting of the Japan Society of Vacuum and Surface Science 2023, 2023.10.31-11.2 Nagoya
  AUTHOR;　Kazutoshi Takahashi, Masaki Imamura, Haruto Ikeda, Ryosuke Koyama, Isamu Yamamoto, Junpei Azuma
  
• Analysis of Unoccupied Electronic States using Angle-resolved Two-photon　Photoelectron Spectroscopy;　2023/02
  ANNOUNCEMENT INFO.;　28th Workshop on Electron Device Interface Technology
  AUTHOR;　Tomohiro Sakata, Hiroaki Miyata, Keiichi Yamada, Sawada Keisuke, Isamu Yamamoto, Junpei Azuma
  
• Photo-excited electron dynamics of zinc phthalocyanine thin films on graphite substrates;　2022/09
  ANNOUNCEMENT INFO.;　The 22nd International Vacuum Congress(IVC-22), Sapporo, Japan, 2022.9.11-16
  AUTHOR;　Sho Nagatomo, Isamu Yamamoto, Junpei Azuma, Masaki Imamura, Kazutoshi Takahashi
  
• Surface Band Bending of Ag-doped Mg2Si Crystals Revealed by Photoelectron Spectroscopy using Synchrotron Radiation and Laser;　2022/09
  ANNOUNCEMENT INFO.;　The 22nd International Vacuum Congress(IVC-22), Sapporo, Japan, 2022.9.11-16
  AUTHOR;　Mamoru Kitaura, Isamu Yamamoto, Junpei Azuma, Masaki Imanura, Kazutoshi Takahashi, Taku Tanimoto, Manabu Ishizaki, Haruhiko Udono, Kiyohisa Tanaka, Akimasa Ohnishi
  
• Spectroscopic studies of laser-induced structural modifications of graphene layers epitaxially-grown on SiC(0001);　2022/09
  ANNOUNCEMENT INFO.;　
  AUTHOR;　Ryosuke Horie, Ryu'ichi Hirosue, Jun'ichi Kanasaki, Kenji Kisoda, Isamu Yamamoto, Junpei Azuma, Kazutoshi Takahashi
  
• Electronic band structures of Magneli phase Ti4O7 studied by angle-resolved photoemission spectroscopy;　2022/09
  ANNOUNCEMENT INFO.;　The 22nd International Vacuum Congress(IVC-22), Sapporo, Japan, 2022.9.11-16
  AUTHOR;　Kotaro Furuta, Junpei Azuma, Isamu Yamamoto, Masayuki Watanabe, Kazutoshi Takahashi
  
• Surface photovoltage effect for n-type Mg2Si(111);　2022/07
  ANNOUNCEMENT INFO.;　The 6th Asia-Pacific Conference on Semiconducting Silicides and Related Materials
  AUTHOR;　Taku Tanimoto, Mamoru Kitaura, Junpei Azuma, Isamu Yamamoto, Masaki Imamura, Kazutoshi Takahashi, Haruhiko Udono, Kiyohisa Tanaka and Akimasa Ohnishi
  
• Band Structure and Electron Dynamics at Ge(001) and (111) Surfaces;　2016/12
  ANNOUNCEMENT INFO.;　The 20th SANKEN International / The 15th SANKEN Nanotechnology Symposium
  AUTHOR;　Jun'ichi Kanasaki, Isamu Yamamoto, Junpei Azuma, Susumu Fukatsu
  
• Temperature dependent Fermi surface in misfit cobaltites studied by ARPES;　2016/12
  ANNOUNCEMENT INFO.;　The 1st Asian Applied Physics Conference, Tsushima, 2016.12.3-4
  AUTHOR;　Sho-ichi Takakura, Isamu Yamamoto, Junpei Azuma and Makoto Maki
  
• Unoccupied electronic states of 3d-transition metal phthalocyanine thin films;　2016/11
  ANNOUNCEMENT INFO.;　International Workshop on Advanced Spectroscopy of Organic Materials for Electronic Applications, Okazaki, 2016.11.23-25
  AUTHOR;　I. Yamamoto, O. Inoue, M. Imamura, K. Takahashi, J. Azuma
  
• Electronic structure of surface conduction band of Ge(001)-c(4x2) and Ge(111)-c(2x8) surfaces studied by two-photon photoelectron spectroscopy;　2016/10
  ANNOUNCEMENT INFO.;　The 13th Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures (ACSIN 2016), Rome, 2016.10.9-15
  AUTHOR;　Isamu Yamamoto, Junpei Azuma, Jun’ichi Kanasaki
  
• Electronic structure of ultrathin Bi(110) films on epitaxial graphene studied by SR and laser photoemission spectroscopy;　2016/10
  ANNOUNCEMENT INFO.;　
  AUTHOR;　Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, and Junpei Azuma
  
• Unoccupied Electronic structure of BiAg surface alloy studied with two-photon photoemission spectroscopy;　2016/10
  ANNOUNCEMENT INFO.;　The 13th Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures (ACSIN 2016), Rome, 2016.10.9-15
  AUTHOR;　Masaki Imamura, Koutaro Matsuishi, Kazutoshi Takahashi, Isamu Yamamoto, and Junpei Azuma
  
• Angle-resolved photoemission study of ultrathin Bi(110) films grown on epitaxial graphene;　2016/07
  ANNOUNCEMENT INFO.;　The 39th International Conference of Vacuum Ultraviolet and X-ray Physics (VUVX2016), Zurich, 2016.7.3-8
  AUTHOR;　Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, and Junpei Azuma
  
• Interface Oxidation and Carrier Lifetime of Graphene/SiC(0001) Studied by Synchrotron Radiation and Laser Photoemission Spectroscopy;　2015/11
  ANNOUNCEMENT INFO.;　The 15th International Conference on the Formation of Semiconductor Interfaces
  AUTHOR;　Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, Junpei Azuma, and Masao Kamada
  
• Linear Dichroism of Topological Surface State Studied by Angle-Resolved Multi-Photon Photoemission Spectroscopy;　2015/11
  ANNOUNCEMENT INFO.;　The 15th International Conference on the Formation of Semiconductor Interfaces
  AUTHOR;　I. Yamamoto, Y, Nogata, J. Azuma, M. Imamura, K, Takahashi and M. Kamada
  
• Unoccupied Electronic Structures of Bi2Te3(111) Studied by Angle-Resolved Multi-Photoemission Spectroscopy;　2015/09
  ANNOUNCEMENT INFO.;　The 15th International Conference on Electronic Structure and Spectroscopy
  AUTHOR;　I. Yamamoto, Y. Nogata, J. Azuma, M. Imamura, K. Takahashi, M. Kamada
  
• Photo-induced insulator-metal transition in Ti4O7 studied by time-resolved photoemission measurement;　2015/05
  ANNOUNCEMENT INFO.;　The 9th International Symposium on Ultrafast Surface Dynamics
  AUTHOR;　Junpei Azuma, Masayuki Watanabe, and Masao Kamada
  
• Two-Photon Photoemission Study of Hydrogen and Oxygen Intercalated Graphene on SiC(0001);　2015/05
  ANNOUNCEMENT INFO.;　The 9th International Symposium on Ultrafast Surface Dynamics
  AUTHOR;　Kazutoshi Takahashi, Masaki Imamura, Isamu Yamamoto, Junpei Azuma and Masao Kamada
  
• Image Potential States of Bi2Te3(111) Studied by Time-Resolved 2-Photon Photoemission Spectroscopy;　2015/05
  ANNOUNCEMENT INFO.;　The 9th International Symposium on Ultrafast Surface Dynamics
  AUTHOR;　I. Yamamoto, Y. Nogata, J. Azuma, M. Imamura, K. Takahashi, M. Kamada
  
• Photo-induced Valence Change of the L-cysteine/Ag Grown in the Aqueous Solution;　2014/08
  ANNOUNCEMENT INFO.;　IUMRS-ICA 2014, Fukuoka Univ.
  AUTHOR;　T. Tsujibayashi, J. Azuma, I. Yamamoto, K. Takahashi and M. Kamada
  
• Occupied and Unoccupied Electronic States of Au(111) Studied by Combined Use of AR1PPE and AR2PPE;　2014/08
  ANNOUNCEMENT INFO.;　IUMRS-ICA 2014, Fukuoka Univ.
  AUTHOR;　Y. Nogata, I. Yamamoto, J. Azuma, M. Imamura, K. Takahashi and M. Kamada
  
• Photo-excited Carrier Dynamics of Topological Insulator Bi2Te3 Studied by Time- and Angle-resolved Two-photon Photoemission Spectroscopy;　2014/08
  ANNOUNCEMENT INFO.;　IUMRS-ICA 2014, Fukuoka Univ.
  AUTHOR;　I. Yamamoto, J. Azuma, K. Ogawa, M. Imamura, K. Takahashi and M. Kamada
  
• Image-potential States on Epitaxial Graphene Grown on SiC(0001) Studied by Time- and Angle-resolved Two-photon Photoemission Spectroscopy;　2014/08
  ANNOUNCEMENT INFO.;　IUMRS-ICA 2014, Fukuoka Univ.
  AUTHOR;　K. Takahashi, M. Imamura, I. Yamamoto, J. Azuma and M. Kamada
  
• アミノ酸L－システイン薄膜の電子状態;　2012/12
  ANNOUNCEMENT INFO.;　
  AUTHOR;　
  
• Photo-induced insulator-metal transition in magneli-phase Ti4O7 studied by time-resolved photoemission measurement;　2012/09
  ANNOUNCEMENT INFO.;　12th International Conference on Electron Spectroscopy and Structure, Saint-Malo, France, September 16-21, 2012
  AUTHOR;　Junpei Azuma, Masayuki Watanabe, and Masao Kamada
  
• Study of Quantum Well States in Bi Thin Film by Two-photon Photoemission Spectroscopy;　2012/09
  ANNOUNCEMENT INFO.;　The 12th International Conference on Electron Spectroscopy and Structure (ICESS-12), September 16-21, 2012, Saint-Malo, France
  AUTHOR;　M. Imamura, S. Fujimasa, K. Takahashi, I. Yamamoto, J. Azuma, M. Kamada, and H. Yasuda
  
• Excited Electronic States on Epitaxial Graphene Studied by Two-photon Photoemission Spectroscopy;　2012/09
  ANNOUNCEMENT INFO.;　The 12th International Conference on Electron Spectroscopy and Structure (ICESS-12), September 16-21, 2012, Saint-Malo, France
  AUTHOR;　K. Takahashi, S. Anami, M. Imamura, I. Yamamoto, J. Azuma, and M. Kamada
  
• Upgrade of Saga-university beamline in SAGA-LS;　2012/07
  ANNOUNCEMENT INFO.;　The 11th International Conference on Synchrotron Radiation Instrumentation (SRI 2012), July 9-13, 2012
  AUTHOR;　K. Takahashi, M. Imamura, I. Yamamoto, J. Azuma, K. Ogawa, M. Kamada, H. Ohkuma, and S. Yamamoto
  
• Electronic structures in unoccupied states of thin Bi film studied with two-photon photoemission spectroscopy;　2011/10
  ANNOUNCEMENT INFO.;　11th International Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures (ACSIN2011)
  AUTHOR;　M. Imamura, S. Fujimasa, K. Takahashi, I. Yamamoto, J. Azuma, M .Kamada
  
• Time-resolved two-photon photoemission study of silicon surface at initial stage of oxidation;　2011/10
  ANNOUNCEMENT INFO.;　11th International Conference on Atomically Controlled Surfaces, Interfaces and Nanostructures (ACSIN2011)
  AUTHOR;　K. Takahashi, K. Ishibashi, Y. Kurahashi, M. Imamura, J. Azuma, M. Kamada
  
• Occupied and Unoccupied Electronic States of Manganese Phthalocyanine Thin Films;　2011/08
  ANNOUNCEMENT INFO.;　28th European conference on surface science (ECOSS28)
  AUTHOR;　I. Yamamoto, J. Azuma, M. Imamura, K. Ogawa, K. Takahashi and M. Kamada
  
• Excited electronic state on Si(001) surface at initial stage of oxidation studied by two-photon photoemission spectroscopy;　2010/07
  ANNOUNCEMENT INFO.;　The 37th International conference on Vacuum Ultraviolet and X-ray Physics (VUVX2010)
  AUTHOR;　K. Takahashi, Y. Kurahashi, T. Koga, J. Azuma, and M. Kamada
  
• Time- and angle-resolved two-photon photoemission study for the image-potential state on graphite;　2009/10
  ANNOUNCEMENT INFO.;　11-th International Conference on Electronic Spectroscopy and Structure
  AUTHOR;　Kazutoshi Takahashi, Junpei Azuma, Masao Kamada
  
• Surface electronic states on Cu(111) studied by time- and angle-resolved two-photon photoemission spectroscopy;　2009/10
  ANNOUNCEMENT INFO.;　11-th International Conference on Electronic Spectroscopy and Structure
  AUTHOR;　Koji Ogawa, Junpei Azuma, Kazutoshi Takahashi, Masao Kamada
  
• Ultrafast photoemission measurement for Surface Photo-Voltage effect on Cr/n-GaAs(100) surface;　2007
  ANNOUNCEMENT INFO.;　The 15th International Conference on Vacuum Ultraviolet Radiation Physics
  AUTHOR;　J. Azuma, S. Nagao, S. Tokudomi, K. Takahashi and M. Kamada
  
• Ultrafast Time Dependence of Surface Photo-Voltage on GaAs(100);　2007
  ANNOUNCEMENT INFO.;　The 15th International Conference on Vacuum Ultraviolet Radiation Physics
  AUTHOR;　S. Tokudomi, J. Azuma, K. Takahashi and M. Kamada
  
• Photoemission Study on Butterfly-Template ZnO;　2007
  ANNOUNCEMENT INFO.;　The 15th International Conference on Vacuum Ultraviolet Radiation Physics
  AUTHOR;　M. Kamada, H. Sugiyama, K. Takahashi, J. Azuma,　J. Gu, W. Zhang, D. Zhang and Q. Guo
  
• Development of the Ultrafast Time-Resolved Photoelectron Spectroscopy;　2005/02
  ANNOUNCEMENT INFO.;　2nd International Symposium on Technologies and Applications of Photoelectron Micro-Spectroscopy with Laser-based VUV sources
  AUTHOR;　J. Azuma, S. Tokudomi, K. Takahashi and M. Kamada
  
• Time-resolved photoemission micro-spectrometer using higher-order harmonics of Ti:sapphire laser;　2005
  ANNOUNCEMENT INFO.;　The Fourteenth International Conference on Vacuum Ultraviolet Radiation Physics
  AUTHOR;　J. Azuma, Y. Kondo and K. Kamada
  

Invited Lecture, Special Lecture

• レーザーとシンクロトロン光を利用した時間分解光電子分光システムの開発;　2013/09
  ANNOUNCEMENT INFO.;　
  AUTHOR;　
  
• Time-Resolved Photoemission Measurements Using Synchrotron Radiation and Laser;　2012/11
  ANNOUNCEMENT INFO.;　International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom, Kumamoto, Japan, Nov. 1-2, 2012
  AUTHOR;　Junpei Azuma, Masayuki Watanabe, Kazutoshi Takahashi, Isamu Yamamoto, Masaki Imamura, Harue Sugiyama, Koji Ogawa, and Masao Kamada
  
• Time-resolved photoemission experiments with synchrotron radiation and laser;　2010/03
  ANNOUNCEMENT INFO.;　
  AUTHOR;　Kazutoshi Takahashi, Junpei Azuma, Masao Kamada