Photoionization of polarized doublet states of Xenon atom

Abstract

We studied experimentally and theoretically the ionization of a two-photon excited superposition of 4f states of Xe atom by probe femtosecond pulse laser in a supersonic beam. The revealed oscillation structure in the observed photoionization signals is associated with the interference of the coherently populated components of Xe doublet states. Our results demonstrate the high efficiency of proposed experimental scheme for registering quantum beats in the photoelectron current.

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

“…The error of frequency determination is defined by the limited range of delays (3 ns) with a factor of 1/10. This additionally confirms our previous observations [7] regarding the lack of a connection between the nature of quantum beats signal modulation and the Paschen-Back effect for fine structure levels. The realization of this effect gives rise to a typical nonlinear dependence of ω m on the magnetic field strength [1,5,18] with prevailing quadratic term such that with a decrease of ν b by two times almost four-times decrease of ω m should be expected.…”

“…Previously, with a similar experiment scheme, we observed quantum beat signal modulation under photoionization of Xe [7] and showed that the nature of this modulation can not be caused by the quadratic Paschen-Back effect. This method (for external magnetic field levels of an order of magnitude of 1 T) proves to be too weak on the background of such splitting of quantum states [7]. Here we demonstrate experimentally that the modulation of quantum beats signals is only observed for odd Xe isotopes and caused by the hyperfine structure of excited levels.…”

“…Full description of the experimental setup used in these studies, including the " pump-probe"method, is given in [6]. Previously, with a similar experiment scheme, we observed quantum beat signal modulation under photoionization of Xe [7] and showed that the nature of this modulation can not be caused by the quadratic Paschen-Back effect. This method (for external magnetic field levels of an order of magnitude of 1 T) proves to be too weak on the background of such splitting of quantum states [7].…”