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Proceedings Paper

Role of valence-band excitation in laser ablation of KC1
Author(s): Richard F. Haglund Jr.; Kai Tang; P. H. Bunton; Ling-jun Wang
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Paper Abstract

We present recent measurements of excited-atom and ion emission from KCl surfaces illuminated by vacuum-ultraviolet synchrotron radiation (h-nu = 8-28 eV) and ultraviolet laser light (h-nu = 4 eV). At low intensities characteristic of the synchrotron experiments, excited atoms are desorbed by simple valence-band excitation process involving the metallization of the KCl surface. At the higher intensities typical of laser desorption and ablation, we observe a strong decrease in K emission as a function of the number of laser shots, but an essentially constant yield of Cl. K(+) and Cl(-) emission at high intensities show similar behavior. The energetics of these desorption phenomena can be treated in a bond-orbital model which shows that creation of a single valence hole is sufficient to excite an ion to an anti-bonding state.

Paper Details

Date Published: 1 June 1991
PDF: 12 pages
Proc. SPIE 1441, Laser-Induced Damage in Optical Materials: 1990, (1 June 1991);
Show Author Affiliations
Richard F. Haglund Jr., Vanderbilt Univ. (United States)
Kai Tang, Vanderbilt Univ. (United States)
P. H. Bunton, Austin Peay State Univ. (United States)
Ling-jun Wang, Univ. of Tennessee (United States)

Published in SPIE Proceedings Vol. 1441:
Laser-Induced Damage in Optical Materials: 1990
Harold E. Bennett; Lloyd L. Chase; Arthur H. Guenther; Brian Emerson Newnam; M. J. Soileau, Editor(s)

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