Above-threshold ionization of hydrogen and hydrogen-like ions by X-ray pulses

• Authors: Henri Bachau , Olimpia Budriga , Mihai Dondera , Viorica Florescu
• Languages of publication: EN

Abstracts

EN

This paper adresses the problem of above-threshold ionization (ATI) of hydrogen interacting with an intense X-ray electromagnetic field. Two approaches have been used. In the first approach, we calculate generalized differential and total cross sections based on second-order perturbation theory for the electron interaction with a monochromatic plane wave, with the A
2 and A · P contributions from the nonrelativistic Hamiltonian (including retardation) treated exactly. In the second approach, we solve the time-dependent Schrödinger equation (TDSE) for a pulsed plane wave using a spectral approach with a basis of oneelectron orbitals, calculated with L
2-integrable B-spline functions for the radial coordinate and spherical harmonics Y
lm for the angular part. Retardation effects are included up to O(1/c), they induce extra terms forcing the resolution of the TDSE in a three dimensional space. Relativistic effects [of O (1/c
2)] are fully neglected. The isoelectronic series of hydrogen is explored in the range Z = 1 − 5 in both TDSE and perturbative approaches. Photoelectron angular distributions are obtained for photon energies of 1 keV and 3 keV for hydrogen, and photon energy of 25 keV for the hydrogenic ion B4+. Perturbative and TDSE calculations are compared.

Keywords

EN

Multiphoton ionization; X-ray; Above threshold ionization; Hydrogen; hydrogenic ions

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2013
• Volume: 11
• Issue: 9
• Pages: 1091-1098

Dates

published

1 - 9 - 2013

online

24 - 11 - 2013

Contributors

author

Henri Bachau

• Centre des Lasers Intenses et Applications, Université Bordeaux I-CNRS-CEA, FR-33405, Talence, France

author

Olimpia Budriga

• National Institute for Laser, Plasma and Radiation Physics, RO-077125, Bucharest-Măgurele, Romania

author

Mihai Dondera

• Faculty of Physics and Centre for Advanced Quantum Physics, University of Bucharest, RO-077125, Bucharest-Măgurele, Romania

author

Viorica Florescu

• Faculty of Physics and Centre for Advanced Quantum Physics, University of Bucharest, RO-077125, Bucharest-Măgurele, Romania

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Identifiers

DOI

10.2478/s11534-012-0140-x