We studied adsorption and desorption of Xe and deuterium on Ni(111) using an optical differential reflectance technique. The main findings are: (i) the differential reflectance varies almost linearly with the surface densities of deuterium and Xe adatoms, and the signals can be described well with a three-layer model and the known dielectric responses of the surface layers: (ii) the adsorption of deuterium at T = 120 K follows the Langmuir kinetics, while the adsorption of Xe at T = 38 K follows the zeroth-order kinetics; (iii) near T = 70 K, the rate of Xe desorption is almost coverage-independent with an activation energy of Edes = 4.4 ± 0.2 kcal/mol. Our analysis suggests that the Xe desorption is likely to be dominated by the escape rate from the corners of two-dimensional Xe islands.
|Original language||English (US)|
|Number of pages||8|
|Journal||Applied Physics A: Materials Science and Processing|
|State||Published - 1996|
ASJC Scopus subject areas
- Materials Science(all)
- Physics and Astronomy (miscellaneous)