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Intensity- and time-dependent spectra of doubly resonant ionization of barium

Antoni Wójcik, R. Parzyński

Published Jan 1, 1991• 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.
The process of formation of doubly charged ions upon multiphoton ionization of barium atoms by linearly and circularly polarized radiation of dye lasers is studied in the frequency range from 16 600 to 17 900 cm-1. A large number of resonance maxima in the yield of Ba+ and Ba2+ ions were observed upon tuning the radiation frequency. It is unambiguously proved that most resonance maxima in the yield of Ba2+ ions are associated with the resonance transitions in the spectrum of Ba+ ions. This fact confirms the cascade mechanism of formation of Ba2+ ions in the frequency range of localization of these maxima. But the number of the resonant maxima in Ba2+ ions yield do not identified by transitions both in spectra of Ba atom and Ba+ ion. This fact indicates on realization of the noncascade mechanism of Ba2+ ions formation in the frequency range of these maxima.
The process of formation of doubly charged ions upon multiphoton ionization of barium atoms by linearly and circularly polarized radiation of dye lasers is studied in the frequency range from 16800 to 18700 cm −1 . A large number of resonance maxima in the yield of Ba + and Ba 2+ ions were observed upon tuning the radiation frequency. It is unambiguously proved that most resonance maxima in the yield of Ba 2+ ions are associated with the resonance transitions in the spectrum of Ba + ions. This fact confirms the cascade mechanism of formation of Ba 2+ ions in the frequency range of localization of these maxima.