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Chief Scientist Laboratories Atomic, Molecular & Optical Physics Laboratory

Chief Scientist: Toshiyuki Azuma (D.Eng.)

Research Summary

Toshiyuki  Azuma(D.Eng.)

We experimentally study wide-ranged physical processes; cold chemical reaction relevant to universe evolution, dynamics of large complex molecules, atom interaction with crystals, from new methods and view points of atomic, molecular and optical physics. We recently have started development of a compact electrostatic ion storage ring dedicated for investigating molecular collisions and dynamics. Low-energy collisions and reactions of cold molecular ions in the specific vibrational and rotational states prepared by the ring is our primary mission to be explored. We have recently a new project to perform merging experiments by combining atomic and molecular beams with an intense ultra-short intense laser. We have also been trying manipulation of high-energy heavy atomic ions by the crystal periodic fields, which is expected to be a new tool for spectroscopy and manipulation of heavy ions in the energy region from EUV to X-rays.

Main Research Fields

  • Physics

Related Research Fields

  • Chemistry
  • Space Science

Research Subjects

  • Atomic, and molecular collisions using an electrostatic ion storage ring
  • Exploring atomic, molecular, and photonic physics utilizing rthe advanced photon sources
  • Resonant coherent excitation of fast highly charged ions

Selected Publications

  • 1.Kono N., Furukawa T., Tanuma H., Matsumoto J., Shiromaru H., Azuma T., Najafian K., Pettersson M. S., Dynefors B., Hansen K.:
    “Inverse internal conversion in C4- below electron detachment threshold”
    Phys. Chem. Chem. Phys. 17, 24732 (2015).
  • 2.Nakano Y., Nakai Y., Komaki K., Takada E., Murakami T., and Azuma T.:
    “Metastable Ar17+ (2S) production by Stark-assisted resonant coherent excitation”
    J. Phys. B 48, 144026 (2015).
  • 3.Ito, G., Furukawa, T., Tanuma, H., Matsumoto, J., Shiromaru, H., Majima,T., Goto, M., Azuma, T., and Hansen, K.:
    "Cooling dynamics of photo-excited C6- and C6H-"
    Phys. Rev. Lett. 112, 183001 (2014).
  • 4.Najafian, K., Pettersson, M.S., Dynefors, B., Shiromaru, H., Matsumoto, J., Tanuma, H., Furukawa, Azuma, T., Hansen, K.:
    "Radiative cooling of C7-"
    J. Chem. Phys. 140, 104311 (2014).
  • 5.Goto M., Sundén, A.E.K., Shiromaru, H., Matsumoto, J., Tanuma, H., Azuma, T., and Hansen K.:
    "Direct observation of internal energy distributions of C5-"
    J. Chem. Phys. 139, 054306 (2013).
  • 6.Goto, M., Matsumoto, J., Shiromaru, H., Achiba, Y., Majima, T., Tanuma, H., Azuma, T.:
    "Laser-induced thermal detachment of hot, large molecular ions under multi-photon absorption conditions",
    Phys. Rev. A 87, 033406 (2013).
  • 7.Nakano, Y., Takano, Y., Ikeda, T., Kanai, Y., Suda, S., Azuma, T., Bräuning, H., Bräuning-Demian, A., Stöhlker, Th., Dauvergne, D., and Yamazaki, Y.:
    "Resonant Coherent Excitation of Li-like Uranium in a Silicon Crystal"
    Phys. Rev. A (Rapid Comm.) 87, 060501R (2013).
  • 8.Nakano, Y., Suda, S., Hatakeyama, A., Nakai, Y., Komaki, K., Yamazaki, Y., Takada, E., and Murakami, T., and Azuma, T.:
    "Selective production of the doubly excited 2p2 (1D) state in He-like Ar16+ ions by resonant coherent excitation."
    Phys. Rev. A 85, 020701 (Rapid Comm) (2012).
  • 9.Sundén, A. E. K., Goto, M., Matsumoto, J., Shiromaru, H., Tanuma, H., Azuma, T., Andersen, J. U., Canton, S. E., and Hansen, K.:
    "Absolute Cooling Rates of Freely Decaying Fullerenes."
    Phys. Rev. Lett. 103, 143001 (2009).
  • 10.Nakano, Y., Kondo, C., Hatakeyama, A., Nakai, Y., Azuma, T., Komaki, K., Yamazaki, Y., Takada, E., and Murakami, T.:
    "Polarization Control in Three-dimensional Resonant Coherent Excitation."
    Phys. Rev. Lett. 102, 085502 (2009).

Recent Research Results

Annual research report

Related Links

Lab Members

Principal investigator

Toshiyuki Azuma
Chief Scientist

Core members

Susumu Kuma
Senior Research Scientist
Masafumi Jo
Senior Research Scientist
Mizuo Maeda
Research Scientist
Naoki Kimura
Research Scientist
Kiattichart Chartkunchand
Postdoctoral Researcher
Sakumi Harayama
Junior Research Associate
Arisa Iguchi
Student Trainee
Takuma Okumura
Visiting Scientist
Shinji Okada
Visiting Scientist
Yuji Nakano
Visiting Scientist
Tadashi Hashimoto
Visiting Scientist
Shinya Yamada
Visiting Scientist
Takahiro Teramoto
Visiting Scientist
Masaaki Baba
Research Consultant
Kyoko Okuma
Administrative Part-time Worker I
Yuki Fukushima
Administrative Part-time Worker I
Mamiko Tonegawa
Administrative Part-time Worker I
Masumi Furumoto
Administrative Part-time Worker II

Contact Information

2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: toshiyuki-azuma [at] riken.jp