Two- and Three-Photon Partial Photoionization Cross Sections of Li+, Ne8+ and Ar16+ under XUV Radiation

In this work, we present the photon energy dependence of the two- and three-photon cross sections of the two-electron Li+, Ne8+ and Ar16+ ions, following photoionization from their ground state. The expressions for the cross sections are based on the lowest-order (non-vanishing) perturbation theory...

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Bibliographic Details
Published inApplied sciences Vol. 7; no. 3; p. 294
Main Authors Hanks, William, Costello, John, Nikolopoulos, Lampros
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2017
Subjects
Argon ions
Atomic properties
Configuration interaction
cross sections
Electric fields
free-electron laser
Ionization
Ionization cross sections
Lithium ions
lowest-order perturbation theory
multiphoton ionization
Neon
Perturbation theory
Photoionization
Photons
Radiation
X-ray radiation
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Summary:In this work, we present the photon energy dependence of the two- and three-photon cross sections of the two-electron Li+, Ne8+ and Ar16+ ions, following photoionization from their ground state. The expressions for the cross sections are based on the lowest-order (non-vanishing) perturbation theory for the electric field, while the calculations are made with the use of an ab initio configuration interaction method. The ionization cross section is dominated by pronounced single photon resonances in addition to peaks associated with doubly excited resonances. In the case of two-photon ionization, and in the non-resonant part of the cross section, we find that the 1D ionization channel overwhelms the 1S one. We also observe that, as one moves from the lowest atomic number ion, namely Li+, to the highest atomic number ion, namely Ar16+, the cross sections generally decrease.
ISSN:2076-3417
2076-3417
DOI:10.3390/app7030294