| Title |
The a3S+ state of KCs revisited: Hyperfine structure analysis and potential refinement |
| ID_Doc |
19944 |
| Authors |
Krumins, V; Tamanis, M; Ferber, R; Oleynichenko, AV; Skripnikov, LV; Zaitsevskii, A; Pazyuk, EA; Stolyarov, AV; Pashov, A |
| Title |
The a3S+ state of KCs revisited: Hyperfine structure analysis and potential refinement |
| Year |
2022 |
| Published |
|
| Abstract |
Laser-induced fluorescence spectra of the c(3)sigma(+)(v(c), J(c) = N-c) -> a(3)sigma(+) (va, Na = Jc +/- 1) transitions excited from the ground X1E+ state of 39K133Cs molecule were recorded with Fourier-transform spectrometer IFS125-HR (Bruker) at the highest achievable spectral resolution of 0.0063 cm(-1). Systematic study of the hyperfine structure (HFS) of the a(3)sigma(+) state for levels with va E [0 , 27] and Na E [24 , 90] shows that the splitting monotonically increases with va. The spectroscopic study was supported by ab initio calculations of the magnetic hyperfine interaction in X 1 E+ and & nbsp; 3(3)sigma E++ states. The discovered variation of the electronic matrix elements with the internuclear distance R is in a good agreement with the observed va-dependencies of the HFS. Overall set of available experimental data on the a3E+ state was used to improve the potential energy curve particularly near a bottom, providing the refined dissociation energy De = 267 . 21(1) cm -1. The ab initio HFS matrix elements, combined with the empirical X1 sigma+ and a(3)sigma(+) PECs in the framework of the invented coupled-channel deperturbation model, reproduce the experimental term values of both ground states within 0.003 cm -1 accuracy up to their common dissociation limit. (C)& nbsp;2022 Elsevier Ltd. All rights reserved. |
| PDF |
https://arxiv.org/pdf/2201.06830
|
