Journal Article10.1103/PHYSREVA.44.232
Photoionization of two-electron atoms using a nonvariational configuration-interaction approach with discretized finite basis
T. N. Chang,X. Tang +1 more
85
TL;DR: The excellent agreement between the present calculation and other existing theoretical and experimental results, in addition to the extensive recent applications of this procedure to the bound excited states of divalent atoms, has further demonstrated the effectiveness of this simple configuration-interaction procedure.
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Abstract: We present an extension of a simple configuration-interaction procedure to the photoionization of two-electron atoms. By using a finite basis set constructed from {ital B} splines, this nonvariational approach does not rely on any optimum procedure, which is often required in other more elaborate configuration-interaction calculations. The quantitative accuracy of this procedure is tested by examining the photoionization cross sections at photon energies immediately above the first ionization threshold, as well as near the doubly excited 2{ital s}2{ital p} {sup 1}{ital P} resonance structure. The {ital S}- and {ital P}-wave phase shifts for the electron-hydrogen scattering calculated with this procedure are also presented. The excellent agreement between the present calculation and other existing theoretical and experimental results, in addition to the extensive recent applications of this procedure to the bound excited states of divalent atoms, has further demonstrated the effectiveness of this simple configuration-interaction procedure.
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Citations
•Dissertation
Photoionization of hydrogen molecule using attosecond laser pulses
Jhon Fredy Pérez-Torres
- 01 Jan 2012
Abstract: We present a theoretical study of dissociative ionization of H2 and D2 produced by xuv atto and femtosecond laser pulses. We pay special attention to the analysis of the autoionization dynamics and investigate the effect of the pulse characteristics (spectrum, duration and chirp) on the proton kinetic energy spectrum and the fully differential electron angular distributions. We show that very short pulses, e.g. of 400 as, lead to angular distributions that are nearly independent of the pulse spectral shape and chirp. However, these angular distributions are practically symmetric, which provides little information on the autoionization dynamics. In contrast, for pulses of a few fs, the angular distributions depend significantly on the spectral shape. In particular, when the bandwidth is narrow and the pulse is not chirped, strong asymmetries in the angular distributions are observed. These asymmetries vary with pulse duration, which is relevant to investigate the autoionization decay dynamics of these states. 2009 Elsevier B.V. All rights reserved.
2
Radiation amplification through autoionizing resonances formed by laser assisted dielectronic recombination in He
J. Zhang,Henri Bachau,R. Gayet +2 more
TL;DR: In this paper, a theoretical model and calculation for the production of autoionizing resonances through laser assisted dielectronic recombination process in He, and its possible application to radiation amplification of UV light.
1
Multiphoton ionization of the calcium atom by linearly and circularly polarized laser fields
Gabriela Buica,Takashi Nakajima +1 more
TL;DR: In this paper, the authors theoretically study multiphoton ionization of the Ca atom irradiated by the second and third harmonics of Ti:sapphire laser pulses (photon energy 3.1$ eV and 4.65 eV, respectively).
1
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