Intensity, pulse width, and polarization dependence of above-threshold-ionization electron spectra
- 1 May 1987
- journal article
- Published by Optica Publishing Group in Journal of the Optical Society of America B
- Vol. 4 (5) , 765-769
- https://doi.org/10.1364/josab.4.000765
Abstract
Some difficulties in above-threshold-ionization experiments (mainly the intensity measurements and space-charge effects) are discussed. New results obtained in a space-charge-free regime are reported. The intensity dependences of the spectra show a clear departure from the predictions of lowest-order perturbation theory. At short pulse duration (50 psec) the peaks appear red shifted, and the effect is amplified in circular polarization. A possible interpretation of this effect in terms of ponderomotive potentials is proposed.Keywords
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