Resonance structure of doubly-charged-ion production during laser dielectronic ionization of atoms

Бондар, І. І.; Суран, В. В.

doi:10.1134/1.567802

Cited by 11 publications

(11 citation statements)

References 2 publications

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Section: Laser Frequency Dependencesupporting

confidence: 93%

“…Figure 1 reveals a resonant structure in Ba + and Ba 2+ yields. This result qualitatively coincides with our previous results [23,24] in the same spectral region but with different intensities. An analysis shows that the resonant maximum in Ba + yield, displayed in Figure 1, is due to five-photon ionization of Ba atoms through the four-photon resonance with state 6p 2 1 D 2 substantially perturbed by the ac Stark effect.…”

Section: Introductionsupporting

confidence: 93%

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Multiphoton-double-ionization probability linearly depends on laser intensity: Experimental studies of barium

2013

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Despite inherently complex multiphoton dynamics, our observations show that Ba double ionization with an infrared laser (8800-8920 cm −1 ) resembles a single-photon process; namely, its probability is proportional to the laser intensity. In this regime, single-electron ionization is due to a four-photon resonant transition through the highly perturbed state 6p 2 1 D 2 , whereas double ionization is realized by the two-electron mechanism. Furthermore, we argue that these conclusions are valid for other alkaline-earth-metal atoms and other parameters of laser radiation.

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Section: Laser Frequency Dependencesupporting

confidence: 93%

Section: Introductionsupporting

confidence: 93%

Multiphoton-double-ionization probability linearly depends on laser intensity: Experimental studies of barium

2013

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“…Originally, NSDI has been discovered experimentally for alkaline-earth atoms [3] (regarding further experimental investigations of NSDI for alkaline-earth atoms, see, e.g., Refs. [4][5][6][7][8][9] and references therein). Later, NSDI has been found in nobel gas atoms [10,11].…”

Section: Introductionmentioning

confidence: 99%

Nonsequential double ionization below laser-intensity threshold: Anticorrelation of electrons without excitation of parent ion

et al. 2011

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Two-electron correlated spectra of non-sequential double ionization below laser-intensity threshold are known to exhibit back-to-back scattering of the electrons, viz., the anticorrelation of the electrons. Currently, the widely accepted interpretation of the anticorrelation is recollision-induced excitation of the ion plus subsequent field ionization of the second electron. We argue that another mechanism, namely simultaneous electron emission, when the time of return of the rescattered electron is equal to the time of liberation of the bounded electron (the ion has no time for excitation), can also explain the anticorrelation of the electrons in the deep below laser-intensity threshold regime. Our conclusion is based on the results of the numerical solution of the time-dependent Schrödinger equation for a model system of two one-dimensional electrons as well as an adiabatic analytic model that allows for a closed-form solution.

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“…The two-electron mechanism of formation of doubly charged ions consists in the simultaneous detachment of two outer (optical) electrons from an atom. Our previous studies have shown that the nonlinear ionization of strontium [3][4][5][6][7] and barium [8][9][10][11] atoms in the IR spectral region (ω=8 200-9 500 cm -1 ) results in the formation of doubly charged ions via the two-electron mechanism, i.e., via the simultaneous detachment of two outer s-electrons from these atoms.…”

Section: Introductionmentioning

confidence: 99%

Peculiarity of formation of doubly charged ions upon multiphoton ionization of barium atoms by linearly and circularly polarized radiation

Суран

Бондар

2007

SPIE Proceedings

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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 16 600 to 17 900 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. But the number of the resonant maxima in Ba 2+ 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 Ba 2+ ions formation in the frequency range of these maxima.

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Resonance structure of doubly-charged-ion production during laser dielectronic ionization of atoms

Cited by 11 publications

References 2 publications

Multiphoton-double-ionization probability linearly depends on laser intensity: Experimental studies of barium

Multiphoton-double-ionization probability linearly depends on laser intensity: Experimental studies of barium

Nonsequential double ionization below laser-intensity threshold: Anticorrelation of electrons without excitation of parent ion

Peculiarity of formation of doubly charged ions upon multiphoton ionization of barium atoms by linearly and circularly polarized radiation

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