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High-order above-threshold ionization: The uniform approximation and the effect of the binding potential

Faria, CFD; Schomerus, H; Becker, W; (2002) High-order above-threshold ionization: The uniform approximation and the effect of the binding potential. PHYS REV A , 66 (4) , Article 043413. 10.1103/PhysRevA.66.043413. Green open access

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Abstract

A versatile semiclassical approximation for intense laser-atom processes is presented. This uniform approximation is no more complicated than the frequently used multidimensional saddle-point approximation and far superior, since it applies for all energies, both close to as well as away from the classical cutoffs. In the latter case, it reduces to the standard saddle-point approximation. The uniform approximation agrees accurately with numerical evaluations for potentials, for which these are feasible, and constitutes a practicable method of calculation, in general. The method is applied to the calculation of high-order above-threshold ionization spectra with various binding potentials: Coulomb, Yukawa, and shell potentials which may model C-60 molecules or clusters. The shell potentials generate rescattering spectra that are more structured and may feature an apparently higher cutoff.

Type: Article
Title: High-order above-threshold ionization: The uniform approximation and the effect of the binding potential
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevA.66.043413
Keywords: TUNNELING REGIME, MULTIPHOTON DETACHMENT, QUANTUM-THEORY, LASER FIELDS, PARENT ION, RESCATTERING, PHOTODETACHMENT, SPECTRA, MODEL, PHOTOELECTRONS
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/9503
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