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.

© 1987 Optical Society of America

Role of final-state effects in above-threshold ionization

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