Nonlinear photoemission from W and Cu investigated by total-yield correlation measurements

Year: 1997

Authors: Bartoli A., Ferrini G., Fini L., Gabetta G., Parmigiani F., Arecchi F.T.

Autors Affiliation: Dep. of Physics and European Laboratory for Non-Linear Spectroscopy, University of Florence, Italy;
INFM and Dep. of Physics, Polytechnic of Milan, Italy;
Materials Division CISE Tecnologie Innovative SpA, milan, Italy;
Istituto Nazionale di Ottica, Largo E. Fermi 6, 50125 Firenze, Italy

Abstract: Nonlinear photoelectric emission from Cu and W is investigated by subpicosecond laser pulses. Using a pump and probe technique, total-yield correlation measurements are obtained without space-charge saturation. The effects of the heating of the conduction electrons induced by the laser pulses are shown, considering the peak to background contrast ratio of the experimental correlation trace. The present analysis clarifies the consequences of a transient nonequilibrium temperature difference between electrons and the lattice on the correlation trace, confirming for W the presence of a thermally assisted photoemission mechanism.

Journal/Review: PHYSICAL REVIEW B

Volume: 56 (3)      Pages from: 1107  to: 1110

KeyWords: Nonequilibrium Electron; Photoelectric-emission; Femtosecond; Tungsten; Metals; Copper
DOI: 10.1103/PhysRevB.56.1107

Citations: 13
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