Above-threshold ionization of atoms in linearly polarized laser fields of relativistic intensities

Journal Article · Thu Nov 15 04:00:00 EST 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.053406· OSTI ID:21028026

Avetissian, H K; Markossian, A G ^[1]

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1. Department of Quantum Electronics, Yerevan State University, 1 A. Manukian, Yerevan 375025 (Armenia)

Within the framework of the relativistic quantum theory the multiphoton above-threshold ionization (ATI) of hydrogenlike atoms in the field of super-strong electromagnetic radiation of linear polarization, taking into account the photoelectron stimulated bremsstrahlung (SB) on the residual ion, is investigated. The latter is considered in the Born approximation by the Coulomb field which allows us to simplify the previous results in the generalized eikonal approximation upon the scattering potential and obtain an analytic formula for the relativistic ATI rate summed over the intermediate transitions of a photoelectron through the virtual states of the atomic continuum. The energetic spectra and angular distributions of photoelectrons are obtained with the secondary SB of photoelectrons. Due to the latter the partial ATI rates are 4 times larger than the ATI rates of the direct process. In contrast to the nonrelativistic case, the main peaks in the angular distributions of photoelectrons are shifted toward the wave propagation direction and have a tendency to be aligned about this direction with the increase of the field intensity.

• OSTI ID: 21028026
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR DISTRIBUTION
ATOMS
BORN APPROXIMATION
BREMSSTRAHLUNG
CORRECTIONS
COULOMB FIELD
EIKONAL APPROXIMATION
IONS
LASER RADIATION
MULTI-PHOTON PROCESSES
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
POLARIZATION
POTENTIALS
RELATIVISTIC RANGE
SCATTERING
SURFACES
VIRTUAL STATES
WAVE PROPAGATION