Eigenchannel R-matrix study of two-photon processes including above-threshold ionization in magnesium
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LucKoenig, E.
Lyras, A.
Lecomte, J. M.
Aymar, M.
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peer reviewed
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Journal of Physics B-Atomic Molecular and Optical Physics
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The approach based on the eigenchannel R-matrix method and multichannel quantum-defect theory, introduced by Robicheaux and Gao to calculate two-photon processes in light alkaline-earth atoms, has been implemented in jj-coupling introducing explicitly spin-orbit effects and employing both the length and velocity forms of the electric dipole transition operator. Emphasis is placed on the identification of the intermediate-and final-state resonances appearing in the cross sections. The efficiency and potential of the method are demonstrated in magnesium, by calculating two-photon ionization cross sections, branching ratios and photoelectron angular distributions for an extended photon energy range, including above-threshold ionization. The contributions of electronic correlation, core-polarization and spin-orbit effects are investigated by a systematic comparison with experimental results and earlier theoretical calculations.
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l2 ci calculation, multiphoton ionization, atomic magnesium, cross-sections, optical-properties, 2-photon processes, energy-spectrum, states, mg, discrete
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<Go to ISI>://A1997YK15600018
http://iopscience.iop.org/0953-4075/30/22/018/pdf/0953-4075_30_22_018.pdf
http://iopscience.iop.org/0953-4075/30/22/018/pdf/0953-4075_30_22_018.pdf
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en
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Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών