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Appl. Sci. 2017, 7(3), 294; doi:10.3390/app7030294

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

School of Physical Sciences, Dublin City University, Dublin 9, Ireland
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Academic Editor: Kiyoshi Ueda
Received: 14 February 2017 / Revised: 7 March 2017 / Accepted: 9 March 2017 / Published: 17 March 2017
(This article belongs to the Special Issue X-Ray Free-Electron Laser)
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Abstract

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. View Full-Text
Keywords: multiphoton ionization; X-ray radiation; free-electron laser; lowest-order perturbation theory; cross sections multiphoton ionization; X-ray radiation; free-electron laser; lowest-order perturbation theory; cross sections
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MDPI and ACS Style

Hanks, W.; Costello, J.T.; Nikolopoulos, L.A.A. Two- and Three-Photon Partial Photoionization Cross Sections of Li+, Ne8+ and Ar16+ under XUV Radiation. Appl. Sci. 2017, 7, 294.

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