Perturbative analysis of the triply differential cross section and circular dichroism in photo-double-ionization of He

Journal Article · Mon Mar 01 04:00:00 EST 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.69.032713· OSTI ID:20640862

Istomin, Andrei Y; Starace, Anthony F ^[1]; Manakov, N L ^[2]

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1. Department of Physics and Astronomy, University of Nebraska, Lincoln, Nebraska 68588-0111 (United States)
2. Physics Department, Voronezh State University, Voronezh 394006 (Russian Federation)

We extend application of our lowest-order perturbative approach (in electron-electron correlation) for analysis of photo-double-ionization (PDI) of He [A.Y. Istomin et al., J. Phys. B 35, L543 (2002)] to excess energies up to 450 eV and to analysis of circular dichroism. We find that account of electron correlation in the final state to first order provides predictions for the triply differential cross section and circular dichroism that are in reasonable agreement with absolute data for excess energies up to 80 eV. For an excess energy of 450 eV, account of electron correlation in both initial and final states is necessary and the predicted triply differential cross sections are in agreement with absolute data only for large mutual ejection angles. We find that at excess energies of a few tens of eV, the PDI is dominated by the 'virtual' knock-out mechanism, while the 'direct' (on-shell) knock-out process gives only small contributions for large mutual ejection angles. As a result, we conclude that the circular dichroism effect at these energies originates from the nonzero electron Coulomb phase shifts.

• OSTI ID: 20640862
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 69; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
DICHROISM
DIFFERENTIAL CROSS SECTIONS
ELECTRON CORRELATION
ELECTRONS
EV RANGE
HELIUM
PERTURBATION THEORY
PHASE SHIFT
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS