SYMPOSIA PAPER Published: 01 January 1991
STP23620S

The Role of Valence-Band Excitation in Laser Ablation of KCl

Source

We present recent measurements of excited-atom and ion emission from KCl surfaces illuminated by vacuum-ultraviolet synchrotron radiation (hv = 8–28 eV) and ultraviolet laser light (hv = 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.

Author Information

Haglund, RF
Tang, K
Bunton, PH
Austin Peay State University, Clarksville, TN
Wang, L-J
University of Tennessee, Chattanooga, TN
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: F01
Pages: 127–138
DOI: 10.1520/STP23620S
ISBN-EB: 978-0-8031-5179-6
ISBN-13: 978-0-8194-0532-6