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HERO ID
1677667
Reference Type
Journal Article
Title
Sticking probability measurement in a reactive system
Author(s)
Berenbak, B; Butler, DA; Riedmuller, B; Papageorgopoulos, DC; Stolte, S; Kleyn, AW
Year
1998
Is Peer Reviewed?
1
Journal
Surface Science
ISSN:
0039-6028
Volume
414
Issue
1-2
Page Numbers
271-278
Web of Science Id
WOS:000076198200029
Abstract
The sticking probability of reactive molecules on surfaces is usually measured using the well-established beam reflectivity technique of King and Wells. The fundamental problem of this technique results from the interaction of the gas with the walls of the chamber. For the majority of gases used in King and Wells' sticking probability measurements, the exposure of the chamber walls to the gas causes changes in the effective pumping speed of the vacuum chamber.
A simple model is presented which shows the influence of the residence rime of particles on the walls on the effective pumping speed of the system. In combination with lest data, this model reveals a very symmetric response to changes in the beam flux. This insight is used to develop a straightforward method for the determination of the initial sticking coefficient S-o, which allows for changes in pumping speed.
In applying the technique to the adsorption of NO on Ru(0001), the initial sticking coefficient is observed to be very high (S-o> 0.9) and almost constant for incident energies between 0.3 eV <E-t<2.5 eV, suggesting more than one dissociation pathway. For the Ru(0001)-(1 x 1)H surface, S-o increases from 0.2 to 0.6 in the same energy :range, indicating a partially activated process. (C) 1998 Elsevier Science B.V. All rights reserved.
Keywords
chemisorption; hydrogen; metallic surfaces; molecule solid reactions; nitrogen oxides; ruthenium; single crystal surfaces; solid-gas interfaces; sticking
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