Linear and nonlinear screening effects in two-photon ionization of xenon
(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.
(Less)
- author
- LHuillier, Anne and Wendin, Göran
- publishing date
- 1987-11-15
- 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
- 2021-01-03 09:36:22
@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}},
}