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Applications of High Field and Short Wavelength Sources (HFSW)

INDUCED BY AC STARK EFFECT VARIATION OF THE MECHANISM OF DOUBLY-CHARGED IONS FORMATION DURING IONIZATION OF Ba ATOMS IN VISIBLE SPECTRAL RANGE

В. В. Суран, І. І. Бондар

Published Jan 1, 1999• 0 citations
Publisher

Abstract

Beginning with first experiments, where the effect of doubly-charged ions formation was discovered [1], intensive investigations to determine the mechanism leading to the production of doubly-charged ions in different spectral ranges are carried out.
DOI
10.1364/hfsw.1999.mc6

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The influence of an additional perturbation (the ac Stark effect) of neutral barium atoms on the formation of doubly charged ions in the course of ionisation of these atoms by visible light (by the second harmonic radiation of an yttrium-aluminium garnet laser) was investigated experimentally. The frequency-tunable radiation of a colour-centre laser (ω = 8500 — 8950 cm -1 ) was used in these investigations to effect the additional perturbation of barium atoms. It was found that this perturbation changed the mechanism of formation of the doubly charged Ba 2+ ions from a stepwise to a two-electron mechanism. The yield of the Ba 2+ ions increased sharply under these conditions.