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 new unknown resonances which occur in the case of multiphoton ionization of Ba atoms at simultaneous influence of two laser fields were discovered. The character of the display of these resonances depends on mutual orientation of polarization vectors of these fields.
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.
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