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Your search keyword '"Petrov I"' showing total 29 results
Start Over Author "Petrov I" Journal journal of physics b: atomic, molecular & optical physics
29 results on '"Petrov I"'

1. Strong impact of the giant resonance on the radiationless decay of the 4d-vacancy in Xe: II. N4, 5OO Auger effect.

Author

Petrov, I D, Lagutin, B M, Sukhorukov, V L, Ehresmann, A, and Schmoranzer, H

Subjects
*GIANT nuclear magnetic resonance, *RADIATIONLESS deactivation, *AUGER effect, *XENON, *MAGNITUDE estimation, *PROBABILITY theory
Abstract

The radiationless decay of the Xe N4, 5 levels is investigated theoretically. The strong influence of the giant resonance in the 5s5p5(1P)εf channel on the partial and total Auger widths via the interchannel mixing is revealed. The computed widths of the N4 and N5 levels, equal to 105.9 and 109.6 meV, respectively, are in excellent agreement with the measured values 104(3) and 111(3) meV (Jurvansuu et al 2001 Phys. Rev. A 64 012502). The shape of the computed N4, 5OO Auger spectrum is in good agreement with the measured one. Interchannel interaction reduces the probability of the 5p5p − 4dεg Auger decay by more than an order of magnitude. This conclusion is supported by the good agreement between computed and measured Auger electron angular distribution parameters. [ABSTRACT FROM AUTHOR]

Published
2014
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2. Photoionization dynamics of excited Ne, Ar, Kr and Xe atoms near threshold.

Author

Sukhorukov, V. L., Petrov, I. D., Schäfer, M., Merkt, F., Ruf, M-W., and Hotop, H.

Subjects
*PHOTOIONIZATION, *NEON, *ARGON, *XENON, *PHYSICS experiments, *NOBLE gases, *AUGER effect, *QUANTUM theory
Abstract

A review of experimental and theoretical studies of the threshold photoionization of the heavier rare-gas atoms is presented, with particular emphasis on the autoionization resonances in the spectral region between the lowest two ionization thresholds 2P3/2 and 2P3/2, accessed from the ground or excited states. Observed trends in the positions, widths and shapes of the autoionization resonances depending on the atomic number, the principal quantum number n, the orbital angular momentum quantum number ℓ and further quantum numbers specifying the fine- and hyperfine-structure levels are summarized and discussed in the light of ab initio and multichannel quantum defect theory calculations. The dependence of the photoionization spectra on the initially prepared neutral state are also discussed, including results on the photoionization cross sections and photoelectron angular distributions of polarized excited states. The effects of various approximations in the theoretical treatment of photoionization in these systems are analysed. The very large diversity of observed phenomena and the numerous anomalies in spectral structures associated with the threshold ionization of the rare-gas atoms can be described in terms of a limited set of interactions and dynamical processes. Examples are provided illustrating characteristic aspects of the photoionization, and sets of recommended parameters describing the energy-level structure and photoionization dynamics of the rare-gas atoms are presented which were extracted in a critical analysis of the very large body of experimental and theoretical data available on these systems in the literature. [ABSTRACT FROM AUTHOR]

Published
2012
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12. Strong impact of the giant resonance on the radiationless decay of the 4d vacancy in Xe: I. Decay of the 4d9np resonances.

Author

Lagutin, B. M., Petrov, I. D., Sukhorukov, V. L., Ehresmann, A., Schartner, K-H, and Schmoranzer, H.

Subjects
*XENON spectra, *GIANT nuclear magnetic resonance, *STRONG interactions (Nuclear physics), *RADIATIONLESS deactivation, *NUCLEAR cross sections
Abstract

The influence of the interchannel interaction on the radiationless decay of the Xe 4d9np resonances is found to be extremely large due to the potential barrier effect. Interaction between the 5s5p–4dεf and 5p5p–4dεg decay channels reduces the decay transition amplitude associated with the outgoing g wave by a factor of about 3. The effect is confirmed by the good agreement between computed and measured photoionization cross sections and polarization parameters of the Xe 5p4mp levels. [ABSTRACT FROM AUTHOR]

Published
2012
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