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Proceedings Paper

Femtosecond dynamics of hot electrons at clean Cu(110) and Cu(100) surfaces
Author(s): Susumu Ogawa; Hrvoje Petek
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Paper Abstract

Hot-electron thermalization by electron-electron scattering is measured by two-photon photoemission spectroscopy at clean Cu(110) and Cu(100) surfaces. Two-photon photoemission spectra are measured as a function crystal face, laser polarization, and photon energy to establish the excitation mechanism. Time-resolved measurements of hot-electrons dynamics using approximately 3.2 eV femtosecond laser excitation light show a two- component decay due to dephasing and population relaxation dynamics. Hot-electron lifetimes in the 1.3 - 3.3 eV energy range decrease from approximately 80 fs to approximately 15 fs as the energy is increased. Energy dependence of the population decay rate is approximately 6.5 times slower than predicted by the Fermi liquid theory and shows a modest dependence on the Cu crystal face. Observation of hot-electron coherence on <EQ 15 fs time scale opens the way for coherent control of hot-electron induced dynamics at metal interfaces by ultrafast lasers.

Paper Details

Date Published: 25 September 1995
PDF: 12 pages
Proc. SPIE 2547, Laser Techniques for Surface Science II, (25 September 1995); doi: 10.1117/12.221465
Show Author Affiliations
Susumu Ogawa, Hitachi Ltd. (Japan)
Hrvoje Petek, Hitachi Ltd. (Japan)

Published in SPIE Proceedings Vol. 2547:
Laser Techniques for Surface Science II
Janice M. Hicks; Wilson Ho; Hai-Lung Dai, Editor(s)

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