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Proceedings Paper

Relativistic photoionization
Author(s): Howard R. Reiss; D. P. Crawford
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Paper Abstract

Different types of relativistic effects in atomic photoionization are shown to have frequency-dependent onset intensities. These phenomena can be explored analytically with the Strong-Field Approximation (SFA), which becomes accurate without need for rescattering corrections when intensities are high enough to be relativistic. Specially interesting results are that electron spin-flip amplitudes and virtual pair creation become important at intensities often not considered to be relativistic. The stabilization effect wherein transition rates decline with increasing intensity is strongly enhanced by relativity when the laser is linearly polarized. With linearly polarized light, photoelectron spectra exhibit a strong displacement towards the 'hotter' or higher-energy end of the spectrum; and both spectra and total transition rates, if calculated nonrelativistically, can be seriously in error for laser intensities I greater than 1 a.u. at typical intense-laser frequencies.

Paper Details

Date Published: 5 March 1999
PDF: 10 pages
Proc. SPIE 3735, ICONO '98: Ultrafast Phenomena and Interaction of Superstrong Laser Fields with Matter: Nonlinear Optics and High-Field Physics, (5 March 1999); doi: 10.1117/12.341458
Show Author Affiliations
Howard R. Reiss, American Univ. (United States)
D. P. Crawford, American Univ. (United States)


Published in SPIE Proceedings Vol. 3735:
ICONO '98: Ultrafast Phenomena and Interaction of Superstrong Laser Fields with Matter: Nonlinear Optics and High-Field Physics
Mikhail V. Fedorov; Vyacheslav M. Gordienko; Vladimir V. Shuvalov; Vladimir D. Taranukhin, Editor(s)

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