https://doi.org/10.1140/epjd/s10053-023-00712-7
Regular Article – Molecular Physics and Chemical Physics
Rotation dependence of v′ = 44 excited-state hyperfine constants obtained via precise measurements of the hyperfine structures of 127I2 lines near 514 nm
Department of Physics, Graduate School of Engineering Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, 240-8501, Yokohama, Japan
Received:
5
March
2023
Accepted:
21
June
2023
Published online:
19
July
2023
Frequency-stabilized lasers are of considerable interest not only for the implementation of time and length standards but also as tools to study atoms and molecules. The absolute frequencies and hyperfine structures of the R(38)44-0, P(36)44-0, R(37)44-0, P(35)44-0, R(36)44-0, P(34)44-0, and R(58)45-0 lines of molecular iodine (127I2) at 514 nm were measured in this study via modulation transfer spectroscopy. The hyperfine splittings were fitted to a four-term Hamiltonian with an uncertainty of approximately 1 kHz to obtain high-precision hyperfine constants. The rotation dependence of the excited-state (B state, v′ = 44) hyperfine constants was determined using the fitted hyperfine constants. Notably, 103 hyperfine transitions were observed, with an uncertainty of 5.6 kHz (a fractional uncertainty of 9.6 × 10–12), thereby providing new optical frequency references for telecommunication and other applications.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
