Strong-Field Ionization Amplitudes for Atomic Many-Electron Targets

The strong-field approximation (SFA) has been widely applied in the literature to model the ionization of atoms and molecules by intense laser pulses. A recent re-formulation of the SFA in terms of partial waves and spherical tensor operators helped adopt this approach to account for realistic atomi...

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Bibliographic Details
Published in:Atoms 2022-09, Vol.10 (3), p.70
Main Authors: Fritzsche, Stephan, Böning, Birger
Format: Article
Language:English
Subjects:
Amplitudes
Angular momentum
Approximation
atomic
Coulomb–Volkov
direct amplitude
distorted-Volkov
electron emission
Electrons
Energy
Field ionization
Ionization
Jena Atomic Calculator
Krypton
Lasers
Mathematical analysis
Observations
Operators (mathematics)
Pulse duration
Sensors
Spherical waves
Tensors
Wave functions
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Summary:The strong-field approximation (SFA) has been widely applied in the literature to model the ionization of atoms and molecules by intense laser pulses. A recent re-formulation of the SFA in terms of partial waves and spherical tensor operators helped adopt this approach to account for realistic atomic potentials and pulses of different shape and time structure. This re-formulation also enables one to overcome certain limitations of the original SFA formulation with regard to the representation of the initial-bound and final-continuum wave functions of the emitted electrons. We here show within the framework of Jac, the Jena Atomic Calculator, how the direct SFA ionization amplitude can be readily generated and utilized in order to compute above-threshold ionization (ATI) distributions for many-electron targets and laser pulses of given frequency, intensity, polarization, pulse duration and carrier–envelope phase. Examples are shown for selected ATI energy, angular as well as momentum distributions in the strong-field ionization of atomic krypton. We also briefly discuss how this approach can be extended to incorporate rescattering and high-harmonic processes into the SFA amplitudes.
ISSN:2218-2004
2218-2004
DOI:10.3390/atoms10030070