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Nonlinear ionization of atomic barium by 9395-cm - 1 laser radiation

D. Sh. Akramova, D. T. Alimov, V. K. Medvedeva, М. А. Преображенский, M. A. Tursunov, P. K. Khalibullaev

Published Jun 1, 1984• 0 citations
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The formation of singly and doubly charged ions upon nonlinear ionization of barium atoms is studied as a function of the frequency and intensity of a 8800-8920-cm−1 IR color center laser. Barium atoms are ionized via the four-photon resonance with the strongly perturbed bound 6p 2 1 D 2 state. Doubly charged barium ions are produced by a two-electron mechanism. It is found that the probability of the formation of doubly charged ions under these conditions linearly depends on the laser radiation intensity.
An experimental investigation was made of the influence of a laser radiation field on the spectrum of barium atoms. The investigation was carried out by the method of three-photon ionization spectroscopy using dye laser radiation (ω = 14 800–18 700 cm − 1 ). The electric field intensity of the laser radiation was 10 3 –10 6 V/cm. This laser radiation field had a strong influence on a number of bound and autoionizing states. The nature of this influence depended on the ratio of the excitation frequencies of bound and autoionizing states.