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Scientific Herald of Uzhhorod University Series Physics

Doubly charged ions formation during multiphoton ionization of alkaline-earth atoms

В. В. Суран

Published Jul 15, 2001• 0 citations
Publisher

Abstract

The results on investigations of process of doubly-charged ions formation during multiphoton ionization of alkaline-earth elements in visible and infrared spectral ranges are presented. It was established that in visible spectral range step­wise mechanism of doubly-charged ions formation is realized, and in infrared spectral range - two-electron mechanism takes place.

DOI
10.24144/2415-8038.2001.9.83-88

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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Jun 15, 2007•0 citations
The results on investigations of process of doubly-charged ions formation during multiphoton ionization of alkaline-earth elements in visible and infrared spectral ranges are presented. It was established that in visible spectral range step­wise mechanism of doubly-charged ions formation is realized, and in infrared spectral range - two-electron mechanism takes place.
The study of the creation of doubly charged ions upon the laser-induced multiphoton ionization of alkaline-earth metals is reviewed. The results show that the features of the creation of the doubly charged ions depend on the spectral range of the ionizing laser radiation. In the ionization of the alkaline-earth atoms by the visible laser radiation, the cascade creation of the doubly charged ions is predominantly implemented when the ions result from the multiphoton ionization of singly charged ions created in the presence of the same laser pulse. In the multiphoton ionization of the alkaline-earth atoms by the IR laser radiation, the two-electron process occurs when the doubly charged ions are directly created from neutral atoms owing to the ionization via induced resonances with strongly perturbed states of these atoms.
Summary form only given. Beginning with first experiments, where the effect of doubly-charged ions formation was discovered, intensive investigations to determine the mechanism leading to the production of doubly-charged ions in different spectral ranges are carried out. The main goal of our work is the creation of conditions for realization of direct two-electron mechanism of Ba/sup 2+/ ions formation in the visible spectral range. The experimental setup consists in following: during ionization of Ba atoms by visible laser radiation we realized strong additional perturbation of atoms by laser radiation of another frequency range.
Experimental investigations of resonant structure in doubly charged ion (A 2+ ) formation were carried out during Sr and Ba atom ionization by infrared laser radiation (ω = 8400-9100 cm -1 ). It has been shown that in this case the mechanism of ion formation is a two-electron process - the ions are produced immediately from the neutral atoms. It has been found for the first time that the resonant structure in A 2+ ion formation in such conditions is due to the excitation and ionization of neutral-atom mixed states. The atomic-state mixing in this case results from the Stark effect provided that the polarizability of these states is very high.
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.