Abstract
Electrons emitted from a high-intensity laser focus (~1014 W/cm2) have been observed by Freeman et al.1 At this intensity, the electrons energy distribution was seen to have a series of low-energy (~1-eV) peaks separated by the photon energy. These are above-threshold-ionization (ATI) peaks and were observed to shift by a few electron volts as the laser pulse width was increased from a short pulse (0.5 ps) to a long pulse (50 ps). This shift is explained by the ponderomotive potential Φj.
© 1994 Optical Society of America
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