ISSN:
1432-0630
Keywords:
PACS: 78.66; 82.65
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract. 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 E des=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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s003390050345
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