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Title: Nondipole Effects in Double Photoionization of He

Abstract

Lowest-order nondipole effects are studied in double photoionization (DPI) of the He atom. Ab initio parametrizations of the quadrupole transition amplitude for DPI from the 1S0-state are presented in terms of the exact two-electron reduced matrix elements. Parametrizations for the dipole-quadrupole triply differential cross section (TDCS) and doubly differential cross section (DDCS) are presented in terms of polarization-independent amplitudes for the case of an elliptically polarized photon. Expressions for the DDCS in terms of the reduced two-electron matrix elements are also given. A general analysis of retardation-induced asymmetries of the TDCS including the circular dichroism effect at equal energy sharing is presented. Our numerical results exhibit a nondipole forward-backward asymmetry in the TDCS for DPI of He at an excess energy of 450 eV that is in qualitative agreement with existing experimental data.

Authors:
;  [1]; ;  [2]
  1. Department of Physics and Astronomy, University of Nebraska, Lincoln, NE 68588-0111 (United States)
  2. Physics Department, Voronezh State University, Voronezh 394006 (Russian Federation)
Publication Date:
OSTI Identifier:
20797872
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 811; Journal Issue: 1; Conference: International symposium on (e,2e) double photoionization, and related topics; 13. international symposium on polarization and correlation in electronic and atomic collisions, Buenos Aires (Argentina), 28-30 Jul 2005; Other Information: DOI: 10.1063/1.2165614; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ASYMMETRY; DICHROISM; DIFFERENTIAL CROSS SECTIONS; DIPOLES; ELECTRONS; ENERGY LEVELS; EV RANGE; HELIUM; MATRIX ELEMENTS; PHOTOIONIZATION; PHOTONS; POLARIZATION; QUADRUPOLES; TRANSITION AMPLITUDES

Citation Formats

Istomin, A. Y., Starace, A. F., Manakov, N. L., and Meremianin, A. V. Nondipole Effects in Double Photoionization of He. United States: N. p., 2006. Web. doi:10.1063/1.2165614.
Istomin, A. Y., Starace, A. F., Manakov, N. L., & Meremianin, A. V. Nondipole Effects in Double Photoionization of He. United States. doi:10.1063/1.2165614.
Istomin, A. Y., Starace, A. F., Manakov, N. L., and Meremianin, A. V. Mon . "Nondipole Effects in Double Photoionization of He". United States. doi:10.1063/1.2165614.
@article{osti_20797872,
title = {Nondipole Effects in Double Photoionization of He},
author = {Istomin, A. Y. and Starace, A. F. and Manakov, N. L. and Meremianin, A. V.},
abstractNote = {Lowest-order nondipole effects are studied in double photoionization (DPI) of the He atom. Ab initio parametrizations of the quadrupole transition amplitude for DPI from the 1S0-state are presented in terms of the exact two-electron reduced matrix elements. Parametrizations for the dipole-quadrupole triply differential cross section (TDCS) and doubly differential cross section (DDCS) are presented in terms of polarization-independent amplitudes for the case of an elliptically polarized photon. Expressions for the DDCS in terms of the reduced two-electron matrix elements are also given. A general analysis of retardation-induced asymmetries of the TDCS including the circular dichroism effect at equal energy sharing is presented. Our numerical results exhibit a nondipole forward-backward asymmetry in the TDCS for DPI of He at an excess energy of 450 eV that is in qualitative agreement with existing experimental data.},
doi = {10.1063/1.2165614},
journal = {AIP Conference Proceedings},
number = 1,
volume = 811,
place = {United States},
year = {Mon Jan 09 00:00:00 EST 2006},
month = {Mon Jan 09 00:00:00 EST 2006}
}