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Dissociative adsorption of O2 on Ag(111)

✍ Scribed by M.E.M. Spruit; A.W. Kleyn

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 635 KB
Volume: 159
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(89)87497-4

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✦ Synopsis

Thermal energy atom scattering (TEAS) is used to determine the initial sticking probability So for dissociative chemisorption of Oe on Ag( I 1 I ). Mixed beams of He and O2 are used to study Se as a function of energy of the molecule (MBTEAS) At thermal energies S, is about 3.5 x 10m6. It drops to immeasurably low values with increasing energy and rises to about 1 x lo-' on further increase of the incident energy (1.6 eV at 45" ). &, seems to scale with E,. Two different mechanisms are responsible for sticking At low energies physisorption-mediated sticking is dominant, and at high energies sticking via an activated precursor prevails. The adsorbed oxygen is removed in a first-order process with a decay time of 1000 s, as determined from the time dependence of the TEAS signal.

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