The effect of lateral interactions on the thermal desorption of N₂ from Ni(100)

Authors

Shikha Varma, Syracuse University
Peter A. Dowben, University of Nebraska-LincolnFollow

Date of this Version

May 1990

Comments

Published in the Journal of Vacuum Science and Technology A 8 (3), May/Jun 1990. Copyright © 1990 American Vacuum Society. Used by permission. For free online abstracts, see http://www.avs.org/literature.jvst.b.aspx

Abstract

We have investigated the desorption of N₂ from Ni(100) using thermal desorption spectroscopy (TDS). A modified Polanyi-Wigner equation has been used to obtain the desorption energy and the preexponential factor, both of which depend on the coverage of the adsorbate. We show that there is a large lateral interaction among the adlayer molecules when N₂ goes down as ordered c (2 X 2) on Ni. In addition, the overlayer ordering, in the thermal desorption process, is observed to affect the thermal desorption spectra.