Catalog Home Page

Parametrizations and dynamical analysis of angle-integrated cross sections for double photoionization including nondipole effects

Istomin, A., Starace, A., Manakov, N., Meremianin, A., Kheifets, A. and Bray, I. (2005) Parametrizations and dynamical analysis of angle-integrated cross sections for double photoionization including nondipole effects. Physical Review A - Atomic, Molecular, and Optical Physics, 72 (5).

[img]
Preview
PDF - Published Version
Download (276kB)
Link to Published Version: http://dx.doi.org/10.1103/PhysRevA.72.052708
*Subscription may be required

Abstract

Similarly to differential cross sections for one-electron photoionization, the doubly differential cross section for double photoionization (DPI) may be conveniently described by four parameters: the singly differential (with respect to energy sharing) cross section (σ0), the dipole asymmetry parameter (β), and two nondipole asymmetry parameters (Y and δ). Here we derive two model-independent representations for these parameters for DPI from a S01 atomic bound state: (i) in terms of one-dimensional integrals of the polarization-invariant DPI amplitudes and (ii) in terms of the exact two-electron reduced matrix elements. For DPI of He at excess energies, Eexc, of 100 eV, 450 eV, and 1 keV, we present numerical results for the asymmetry parameters within the framework of the convergent close-coupling theory and compare them with results of lowest-order (in the interelectron interaction) perturbation theory (LOPT). The results for Eexc=1keV exhibit a nondipole asymmetry that is large enough to be easily measured experimentally. We find excellent agreement between our LOPT results and other theoretical predictions and experimental data for total cross sections and ratios of double to single ionization cross sections for K-shell DPI from several multielectron atoms.

Publication Type: Journal Article
Murdoch Affiliation: Centre for Atomic, Molecular and Surface Physics
Publisher: The American Physical Society
Copyright: © 2005 The American Physical Society
URI: http://researchrepository.murdoch.edu.au/id/eprint/13090
Item Control Page Item Control Page

Downloads

Downloads per month over past year