Spectroscopy and physics of atoms and molecules

Modulation of quantum beats signal upon photoionization of Xe isotopes in the magnetic field

E. A. Viktorov^a, P. Yu. Serdobintsev^a, N. N. Bezuglov^a, K. Miculis<sup>b

a</sup> Department of Optics, Faculty of Physics, St. Petersburg State University, St. Petersburg, Russia
^b National Engineering Physics Institute "MEPhI", Moscow, Russia

Abstract: Photoionization processes involving polarized Xe atoms in the presence of an external magnetic field were analyzed in our previous studies. It was shown that the modulation of quantum beats in the observed electronic photo signals could not be explained by the Paschen-Back effect accounting for fine-structure levels only. In the current work, ionized Xe$^+$ isotopes are used as the output channel of photoionization. By comparing the temporal partial signals in the mass spectra of the Xe$^+$ isotopes, it was possible to explain the modulation of quantum beats in ion fluxes as a consequence of the presence of the hyperfine structure in the Zeeman components of the $^{129}$Xe and $^{131}$Xe. isotopes.

Keywords: quantum beats, hyperfine structure, Zeeman effect, two-photon excitation, femtosecond ionization, “pump-probe”-experiment.

Received: 29.04.2022
Revised: 19.09.2022
Accepted: 23.09.2022

DOI: 10.21883/OS.2022.11.53766.3447-22

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