Resonant electron-atom bremsstrahlung in an intense laser field

Authors

A. N. Zheltukhin, Voronezh State University, Voronezh, Russia
A. V. Flegel, Voronezh State University, Voronezh, Russia
M. V. Frolov, Voronezh State University, RussiaFollow
N. L. Manakov, Voronezh State UniversityFollow
Anthony F. Starace, University of Nebraska-LincolnFollow

Document Type

Article

Date of this Version

2-2014

Citation

PHYSICAL REVIEW A 89, 023407 (2014); DOI: 10.1103/PhysRevA.89.023407

Comments

© 2014 American Physical Society. Used by permission.

Abstract

We analyze a resonant mechanism for spontaneous laser-assisted electron bremsstrahlung (BrS) involving the resonant transition (via either laser-assisted electron-ion recombination or electron-atom attachment) into a laser-dressed intermediate quasibound state (corresponding, respectively, to either a field-free neutral atom or a negative-ion bound state) accompanied by ionization or detachment of this state by the laser field. This mechanism leads to resonant enhancement (by orders of magnitude) of the BrS spectral density for emitted photon energies corresponding to those for laser-assisted recombination or attachment. We present an accurate parametrization of the resonant BrS amplitude in terms of the amplitudes for nonresonant BrS, for recombination or attachment to the intermediate state, and for ionization or detachment of this state. The high accuracy of our general analytic parametrization of the resonant BrS cross section is shown by comparison with exact numerical results for laser-assisted BrS spectra obtained within time-dependent effective range theory. Numerical estimates of resonant BrS in electron scattering from a Coulomb potential are also presented.