Publikationsdatum:
2019-08-27
Beschreibung:
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.
Schlagwort(e):
OPTICS
Materialart:
In: Laser-induced damage in optical materials: 1990; Proceedings of the 22nd Annual Boulder Damage Symposium, Boulder, CO, Oct. 24-26, 1990 (A93-21205 06-74); p. 127-138.
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