Resonant mixing of excited states in multiphoton ionization of a Ba atom by radiation of a color center laser

І. І. Бондар

І. І. Бондар, В. В. Суран

І. І. Бондар, В. В. Суран

The resonance structure of doubly-charged-ion production during the ionization of Ba atoms by infrared radiation (color-center laser radiation) is identified. It is shown that this structure is due to the excitation of states of the neutral Ba atom which are strongly perturbed as a result of the Stark effect under conditions such that the dynamic polarizability has large absolute values and depends strongly on the frequency of the radiation.

В. В. Суран, І. І. Бондар, M. I. Dudich

At three-photon ionization of aligned Ba atoms by radiation of laser on color centers (8300 - 9100 cm-1) resonant maxima caused by two-photon excitation of bound states were observed. Moreover, maxima which can't be explained by known processes were also observed.

Joseph S. Bakos

І. І. Бондар, В. В. Суран, M. I. Dudich

Experimental investigations of resonant structure in doubly charged ion (A 2+ ) formation were carried out during Sr and Ba atom ionization by infrared laser radiation (ω = 8400-9100 cm -1 ). It has been shown that in this case the mechanism of ion formation is a two-electron process - the ions are produced immediately from the neutral atoms. It has been found for the first time that the resonant structure in A 2+ ion formation in such conditions is due to the excitation and ionization of neutral-atom mixed states. The atomic-state mixing in this case results from the Stark effect provided that the polarizability of these states is very high.