Abstract

Two modifications of molecular beam relaxation spectrometry (MBRS) of surface processes are described, both making use of partial modulation in order to study nonlinear processes: In the first experiment a partially modulated beam is used; in the second experiment a constant beam is directed to the surface, and the surface temperature is modulated due to absorption of a modulated beam of uv light. The characteristic features of both methods are compared and discussed. The efficiency of MBRS is shown by results obtained for the decomposition of formic acid on Pt, and of methanol on NiO.

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