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Springer series on atomic, optical, and plasma physics

Radiative Characteristics of Polarized Atoms and Ions

FRANK B. ROSMEJ, Valery Alexandrovich Astapenko, Valery S. Lisitsa

Published Jan 1, 2021• 1 citation
Publisher
DOI
10.1007/978-3-030-05968-2_2

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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.
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.
A theoretical analysis is made of the polarization of atomic states (inhomogeneous distribution over magnetic sublevels) induced by collisions with particles polarized by a laser field. The transfer of polarization may be observed by investigating the polarization of the spontaneous radiation emitted from atoms. The polarization tensor of such spontaneous radiation is calculated. A close relationship between the components of this tensor and the characteristics of an elementary scattering event is established.