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  • Letter
  • Open Access

Isotope shift of fine structure of Kr+ and hyperfine structure of Kr+83 by strong-field ultrahigh-resolution Fourier-transform spectroscopy

Toshiaki Ando, Kana Yamada, Atsushi Iwasaki, and Kaoru Yamanouchi*,†

  • *Present address: Institute for Attosecond Laser Facility, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
  • †Contact author: kaoru@chem.s.u-tokyo.ac.jp
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Phys. Rev. Research 7, L022025 – Published 25 April, 2025

DOI: https://doi.org/10.1103/PhysRevResearch.7.L022025

Abstract

We determine the energies of hyperfine structure splitting of Kr+83 and isotope shifts in the fine structure splitting of Kr+ with precision of sub-MHz (∼10−5cm−1) by strong-field ultrahigh resolution Fourier-transform spectroscopy. From the splitting energies, we determine the hyperfine structure constants of Kr+83 and the isotope shift parameters of Kr+. Based on the field shift parameters, we identify the deformation of the electron density distribution of the 4p orbital of Kr+ originating from the relativistic effect.

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References (35)

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Phys. Rev. Research 7, L022025– Published 25 April, 2025
  • Received 4 July 2024
  • Accepted 18 March 2025
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