We investigated the two-dimensional electron momentum distributions of atomic negative ions in an intense laser field by solving the time-dependent Schrödinger equation (TDSE) and using the first- and second-order strong-field approximations (SFAs). We showed that photoelectron energy spectra and low-energy photoelectron momentum distributions predicted from SFAs are in reasonable agreement with the solutions from the TDSE. More importantly, we showed that accurate electron-atom elastic scattering cross sections can be retrieved directly from high-energy electron momentum spectra of atomic negative ions in the laser field. This opens up the possibility of measuring electron-atom and electron-molecule scattering cross sections from the photodetachment of atomic and molecular negative ions by intense short lasers, respectively, with temporal resolutions in the order of femtoseconds.
X. Zhou et al., "Retrieval of Electron-Atom Scattering Cross Sections from Laser-Induced Electron Rescattering of Atomic Negative Ions in Intense Laser Fields," Physical Review A - Atomic, Molecular, and Optical Physics, vol. 77, no. 5, American Physical Society (APS), May 2008.
The definitive version is available at https://doi.org/10.1103/PhysRevA.77.053410
Keywords and Phrases
Elastic Scattering; Laser Beam Effects; Molecular Dynamics; Negative Ions; Photoelectron Spectroscopy; Schrodinger Equation, Electron Momentum Distributions; Electron-Atom Scattering; Strong Field Approximations (SFA), Electron Scattering
International Standard Serial Number (ISSN)
Article - Journal
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