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Kiyoshi Ishikawa

  (石川 潔)

Profile Information

Affiliation
Associate Professor, Graduate School of Science, University of Hyogo
Degree
PhD (Science)(Mar, 1993, Kyoto University)

ORCID ID
 https://orcid.org/0000-0001-5140-744X
J-GLOBAL ID
200901034410747510
researchmap Member ID
1000033327

External link

Papers

 69
  • Kiyoshi Ishikawa
    Applied Physics B, 130 71, May, 2024  Peer-reviewedLead authorCorresponding author
  • Kiyoshi ISHIKAWA
    Physics Education in University, 30(1) 30-34, Mar 15, 2024  Peer-reviewedLead authorCorresponding author
  • Kiyoshi Ishikawa
    The Journal of Chemical Physics, 159(6) 064303-1-064303-10, Aug 14, 2023  Peer-reviewedLead authorCorresponding author
    The pseudopotentials and dispersion potentials are applied to a theoretical study of the hyperfine splitting frequencies of the ground-state paramagnetic hydrogen (H) and alkali-metal (Li, Na, K, Rb, and Cs) atoms in noble gases (He, Ne, Ar, Kr, and Xe). Using classical turning points for statistical averages, we find that numerical calculations based on second-order perturbation theory fit the measured frequency shifts well over a wide temperature range. The characteristic energy, pseudopotential height, and electric-dipole polarizability allow us to consistently determine the van der Waals radii and electron scattering lengths of noble-gas atoms. This study shows that the hyperfine splitting frequency of alkali-metal atoms is a good measure for investigating colliding partners.
  • Kiyoshi Ishikawa, Mayu Yamamoto
    Applied Physics B, 129(7) 113, Jun 17, 2023  Peer-reviewedLead authorCorresponding author
  • Kiyoshi Ishikawa
    The Journal of Chemical Physics, 158(8) 084306-084306, Feb 28, 2023  Peer-reviewedLead authorCorresponding author
    Theoretical pseudopotentials and dispersion potentials are used to study ground-state hyperfine splitting frequencies of alkali-metal atoms (Li, Na, K, Rb, and Cs) in noble gases (He, Ne, Ar, Kr, and Xe) in all combinations. With a single fitting parameter, calculations based on first-order perturbation theory qualitatively present each temperature dependence of the measured frequency shift. With this parameter and excitation energies of alkali-metal and noble-gas atoms, the hyperfine splitting frequency of alkali-metal atoms is suitable for investigating the properties of noble-gas atoms, such as the s-wave scattering length of electrons, the electric-dipole polarizability, and the van der Waals radius. This study suggests the possibility of improving excitation energies and van der Waals potentials of colliding pairs.

Presentations

 146

Research Projects

 18

Industrial Property Rights

 6