Above-threshold multiphoton photoelectric effect of a gold surface
- 1 January 1993
- journal article
- Published by SPIE-Intl Soc Optical Eng in Optical Engineering
- Vol. 32 (10) , 2476-2481
- https://doi.org/10.1117/12.145288
Abstract
A discrete structure consisting of peaks separated by hv photon energy was found experimentally in the photoelectron energy spectrum, when illuminating a gold target surface by relatively long light pulses (approximately nanoseconds) and using moderate (approximately 120 MW/cm2) intensity of Nd:glass lasers (λ = 1.06 μm). This structure can be considered as the above-threshold photoeffect (ATP) of metal surfaces. Its occurrence at surprisingly low laser intensities [which are four orders of magnitude less than the typical intensity range of the analogous above-threshold ionization (ATI) of atoms] was observed when the space charge was considerably eliminated.Keywords
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