Centers & Labs

Chief Scientist Laboratories

Atomic, Molecular & Optical Physics Laboratory

Chief Scientist: Toshiyuki Azuma (D.Eng.)
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 Field

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).

Lab Members

Principal Investigator

Toshiyuki Azuma
Chief Scientist

Core Members

Takane Kobayashi
Senior Research Scientist
Yuji Nakano
Senior Research Scientist
Susumu Kuma
Research Scientist
Sebastian Menk
Postdoctoral Researcher
Shinji Okada
Contract Researcher
Paul ThomasMarie Bertier
International Program Associate
Matthew Lindley
Student Trainee
Yuka Takano
Assistant
Rie Sato
Part-time Worker

Contact information

2-1 Hirosawa, Wako, Saitama 351-0198, Japan

Email: toshiyuki-azuma [at] riken.jp

Related links

Annual research report