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Proceedings Paper

Nonthermal photodesorption of N2 from Ag(111)
Author(s): R. M. Rao; R. J. Beuhler; Michael G. White
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Paper Abstract

We have measured translational and rotational energy distributions of N2 molecules following desorption from a Ag(111) surface by infrared (1064 nm) radiation. The observed desorption yields were large even at laser fluences far below that required for laser-induced thermal desorption. State-resolved laser techniques using coherent VUV radiation showed that the rotational and translational energy distributions of the desorbing N2 molecules are not consistent with the predictions of the heat diffusion model governing laser-induced surface heating. These results suggest that physisorbed adsorbates can couple directly to the nascent-phonon distribution or the nascent electron-hole pairs in the photoexcited substrate without heating of the surface.

Paper Details

Date Published: 30 April 1998
PDF: 9 pages
Proc. SPIE 3272, Laser Techniques for Surface Science III, (30 April 1998); doi: 10.1117/12.307122
Show Author Affiliations
R. M. Rao, Brookhaven National Lab. (United States)
R. J. Beuhler, Brookhaven National Lab. (United States)
Michael G. White, Brookhaven National Lab. (United States)

Published in SPIE Proceedings Vol. 3272:
Laser Techniques for Surface Science III
Hai-Lung Dai; Hans-Joachim Freund, Editor(s)

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