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Linear and nonlinear screening effects in two-photon ionization of xenon

LHuillier, Anne and Wendin, Göran (1987) In Physical Review A 36(10). p.4747-4758
Abstract

We apply the random-phase approximation to two-photon ionization. We develop a formalism which, by means of screened electron-photon interactions, includes the nonlinear response and, in particular, double-excitation processes. The theory is illustrated by numerical calculations of the two-photon ionization cross section of the external (5p and 5s) shell of xenon, over a large energy range: from the two-photon ionization threshold, in the discrete resonance region, and above the one-photon ionization threshold. We show the influence of different many-electron effects, for example, ground-state and final-state correlation, and linear and nonlinear screening. Compared with an independent-electron picture, screening effects lead to a large... (More)

We apply the random-phase approximation to two-photon ionization. We develop a formalism which, by means of screened electron-photon interactions, includes the nonlinear response and, in particular, double-excitation processes. The theory is illustrated by numerical calculations of the two-photon ionization cross section of the external (5p and 5s) shell of xenon, over a large energy range: from the two-photon ionization threshold, in the discrete resonance region, and above the one-photon ionization threshold. We show the influence of different many-electron effects, for example, ground-state and final-state correlation, and linear and nonlinear screening. Compared with an independent-electron picture, screening effects lead to a large reduction of the ionization cross section at low photon energy and in contrast, to an important enhancement at higher photon energy, due to the influence of double-excitation and -ionization processes.

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author
and
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review A
volume
36
issue
10
pages
12 pages
publisher
American Physical Society
external identifiers
  • scopus:0002975921
ISSN
1050-2947
DOI
10.1103/PhysRevA.36.4747
language
English
LU publication?
no
id
f6e5912b-d788-4087-9c09-2ac0e0f53e7d
date added to LUP
2019-05-22 16:06:04
date last changed
2025-10-14 11:13:53
@article{f6e5912b-d788-4087-9c09-2ac0e0f53e7d,
  abstract     = {{<p>We apply the random-phase approximation to two-photon ionization. We develop a formalism which, by means of screened electron-photon interactions, includes the nonlinear response and, in particular, double-excitation processes. The theory is illustrated by numerical calculations of the two-photon ionization cross section of the external (5p and 5s) shell of xenon, over a large energy range: from the two-photon ionization threshold, in the discrete resonance region, and above the one-photon ionization threshold. We show the influence of different many-electron effects, for example, ground-state and final-state correlation, and linear and nonlinear screening. Compared with an independent-electron picture, screening effects lead to a large reduction of the ionization cross section at low photon energy and in contrast, to an important enhancement at higher photon energy, due to the influence of double-excitation and -ionization processes.</p>}},
  author       = {{LHuillier, Anne and Wendin, Göran}},
  issn         = {{1050-2947}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{10}},
  pages        = {{4747--4758}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review A}},
  title        = {{Linear and nonlinear screening effects in two-photon ionization of xenon}},
  url          = {{http://dx.doi.org/10.1103/PhysRevA.36.4747}},
  doi          = {{10.1103/PhysRevA.36.4747}},
  volume       = {{36}},
  year         = {{1987}},
}