Superfluid helium droplet beam for exploring ultracold molecular dynamics

• Project/Area Number: 15K17817
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Physical chemistry
• Research Institution: Institute of Physical and Chemical Research
• Principal Investigator: Kuma Susumu 国立研究開発法人理化学研究所, 東原子分子物理研究室, 研究員 (50600045)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2016: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2015: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
• Keywords: 低温分子 / ヘリウム液滴 / 超流動 / ナノ粒子 / 超流動ヘリウム液滴 / 極低温分子 / 低温化学

Outline of Final Research Achievements

Efficient cooling of molecules from room temperature and long-time observation of their properties are necessary to understand the characteristic molecular dynamics in the ultracold temperature. We proposed the new method to explore the low-temperature molecular dynamics by extending the experimental technique of superfluid helium droplets, that are at present the most ideal cold matrix medium. In this research period, we generated an intense, pulsed droplet beam consisting of micron-size helium droplets. These droplets have a enough capability of capturing small-size molecules to large, nano-clusters.

Research Products

• [Journal Article] Ro-vibrational Spectra of (para-H2)N-CH4 in He Droplets (2016)
  • Author(s): Hiromichi Hoshina, Russell Sliter, Aakash Ravi, Susumu Kuma, Takamasa Momose, and Andrey F. Vilesov
  • Journal Title: ChemPhysChem Volume: 17 Issue: 22 Pages: 3818-3825
  • DOI: 10.1002/cphc.201600484
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Single-atom response of helium atoms to pulses from an EUV free-electron laser: Implications for the subsequent development of superfluorescence (2016)
  • Author(s): James R. Harries, Chiaki Ohae, Susumu Kuma, Kyo Nakajima, Tadashi Togashi, Yuki Miyamoto, Noboru Sasao,Hiroshi Iwayama, Mitsuru Nagasono, Makina Yabashi, and Eiji Shigemasa
  • Journal Title: PHYSICAL REVIEW A Volume: 94 Issue: 6 Pages: 063416-063416
  • DOI: 10.1103/physreva.94.063416
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Observation of a shape resonance of the positronium negative ion (2016)
  • Author(s): K. Michishio, T. Kanai, S. Kuma, T. Azuma, K. Wada, I. Mochizuki, T. Hyodo, A. Yagishita, and Y. Nagashima
  • Journal Title: Nature Communications Volume: 7 Issue: 1 Pages: 11060-11060
  • DOI: 10.1038/ncomms11060
  • Peer Reviewed / Open Access
• [Journal Article] Simultaneous Measurements of Superradiance at Multiple Wavelength from Helium Excited States: II. Analysis. (2016)
  • Author(s): Ohae, C., Harries, J.R., Iwayama, H., Kawaguchi, K., Kuma, S., Miyamoto, Y., Nagasono, M., Nakajima, K., Nakano, I., Shigemasa, E., Sasao, N., Uetake, S., Wakabayashi, T., Yoshimi, A., Yoshimura, K., Yoshimura, M
  • Journal Title: J. Phys. Soc. Jpn. Volume: 85 Issue: 3 Pages: 034301-034301
  • DOI: 10.7566/jpsj.85.034301
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] A streak camera study of superfluorescence at multiple wavelengths from helium atoms excited using free electron laser pulses (2015)
  • Author(s): Harries, J.R., Iwayama, H., Nagasono, M., Togashi, T., Yabashi, M., Kuma, S., Nakajima, K., Miyamoto, Y., Ohae, C., Sasao, N., Shigemasa, E
  • Journal Title: Journal of Physics B: Atomic, Molecular and Optical Physics Volume: 48 Issue: 10 Pages: 105002-105002
  • DOI: 10.1088/0953-4075/48/10/105002
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Simultaneous measurements of super-radiance at multiple wavelengths from helium excited states: I. Experiment (2015)
  • Author(s): K. Nakajima, J. R. Harries, H. Iwayama, S. Kuma, Y. Miyamoto, M. Nagasono, C. Ohae, T. Togashi, M. Yabashi, E. Shigemasa and N. Sasao
  • Journal Title: Journal of the Physical Society of Japan Volume: 84 Issue: 5 Pages: 054301-054301
  • DOI: 10.7566/jpsj.84.054301
  • NAID: 210000133548
  • Peer Reviewed
• [Journal Article] Infrared absorption spectra of SiF4 and its clusters in solid parahydrogen (2015)
  • Author(s): H. Ooe, Y. Miyamoto, S. Kuma, N. Sasao, K. Kawaguchi
  • Journal Title: Chem.Phys.Lett. Volume: 631-632 Pages: 54-58
  • DOI: 10.1016/j.cplett.2015.04.057
  • Peer Reviewed
• [Presentation] A pulsed, huge helium droplet beam for the study of low temperature molecular dynamics (2017)
  • Author(s): Susumu Kuma and Toshiyuki Azuma
  • Organizer: 日本化学会第97春季年会
  • Place of Presentation: 慶應義塾大学
  • Year and Date: 2017-03-16
• [Presentation] Production of large helium droplets by a pulsed nozzle for cold molecular ion processes (2016)
  • Author(s): S. Kuma and T. Azuma
  • Organizer: 原子衝突学会第41回年会
  • Place of Presentation: 富山大学
  • Year and Date: 2016-12-10
• [Presentation] Development of superfluid helium droplet beam for cold molecular ion dynamics (2016)
  • Author(s): S. Kuma and T. Azuma
  • Organizer: 第13回AMO討論会
  • Place of Presentation: 理化学研究所
  • Year and Date: 2016-06-03
• [Presentation] 極低温イオンダイナミクス探索のための 超流動ヘリウム液滴ビームの開発 (2016)
  • Author(s): 久間 晋, 東 俊行
  • Organizer: 日本物理学 会第 71 回年次大会
  • Place of Presentation: 東北学院大学（宮城・仙台）
  • Year and Date: 2016-03-19
• [Presentation] Dynamics of helium droplets in a cryogenic electrostatic ion storage ring (2015)
  • Author(s): Susumu Kuma, Yuji Nakano, Yoshinori Enomoto and Toshiyuki Azuma
  • Organizer: Pacicfichem2015
  • Place of Presentation: ホノルル（アメリカ）
  • Year and Date: 2015-12-15
  • Int'l Joint Research
• [Presentation] Rotational and translational dynamics of hydrogen fluoride in solid parahydrogen (2015)
  • Author(s): S. Kuma, Y. Miyamoto, H. Ooe, N. Sasao and K. Kawaguchi
  • Organizer: Pacicfichem2015
  • Place of Presentation: ホノルル（アメリカ）
  • Year and Date: 2015-12-15
  • Int'l Joint Research
• [Presentation] Cold molecular ions in superfluid helium droplets: A new beamline for RICE (2015)
  • Author(s): Susumu Kuma, Yuji Nakano, Yoshinori Enomoto and Toshiyuki Azuma
  • Organizer: 原子衝突学会第40回年会
  • Place of Presentation: 首都大学東京（東京・八王子）
  • Year and Date: 2015-09-28
• [Presentation] Molecular ions in superfluid helium droplets for RICE (2015)
  • Author(s): Susumu Kuma, Yuji Nakano, Yoshinori Enomoto and Toshiyuki Azuma
  • Organizer: 6th International Workshop on Electrostatic Storage Devices
  • Place of Presentation: 首都大学東京（東京・八王子）、理化学研究所（埼玉・和光）
  • Year and Date: 2015-06-08
  • Int'l Joint Research