Role of valence-band excitation in laser ablation of KC1

Richard F. Haglund Jr.; Kai Tang; P. H. Bunton; Ling-jun Wang

doi:10.1117/12.57226

1 June 1991 Role of valence-band excitation in laser ablation of KC1

Richard F. Haglund Jr., Kai Tang, P. H. Bunton, Ling-jun Wang

Proceedings Volume 1441, Laser-Induced Damage in Optical Materials: 1990; (1991) https://doi.org/10.1117/12.57226
Event: Laser-Induced Damage in Optical Materials: 1990, 1990, Boulder, CO, United States

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.

Citation Download Citation

Richard F. Haglund Jr., Kai Tang, P. H. Bunton, and Ling-jun Wang "Role of valence-band excitation in laser ablation of KC1", Proc. SPIE 1441, Laser-Induced Damage in Optical Materials: 1990, (1 June 1991); https://doi.org/10.1117/12.57226

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