Electron Impact Desorption of Xe from the Tungsten (110) Plane.
Abstract
The electron stimulated desorption of Xe on the clean and on oxygen and CO covered tungsten (110) surfaces has been investigated. Only neutral Xe desorption was observed; a very small initial regime with cross section 10 to the minus 17th power sq cm. is followed by a slow decay with cross section 3 x 10 to the minus 19th power sq. cm. The Xe yield varies nonlinearly with coverage, suggesting desorption from edges of islands or from sites with less than their full complement of nearest neighbor Xe atoms. Desorption from oxygen or CO covered surfaces results in an apparent desorption cross section identical to that of the underlying adsorbate. This results from a kicking off of Xe by electron desorbed O or CO. The true cross sections for these processes are approx. 10 to the minus 14th power sq. cm. for Xe-O and approx. 10 to the minus 15th power sq. cm. for Xe-CO. Some speculations about the mechanism, particularly the absence of ions are presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1981
- Accession Number
- ADA096910
Entities
People
- Q. J. Zhang
- R. Gomer
Organizations
- University of Chicago