Institut für Physikalische Chemie der Universität Hamburg, Laufgraben 24, D-2000 Hamburg 13, Germany
Abstract:
A new modification of molecular beam relaxation spectrometry (MBRS) of surface processes is described making use of partial modulation in order to study nonlinear processes: a constant particle beam is directed towards the catalyst surface, the surface temperature is modulated due to absorption of a modulated beam of UV light, reaction products are analyzed by use of phase sensitive mass spectrometric detection. The application of the method is shown by a study of catalytic decomposition of methanol on polycrystalline NiO. Formation of CO was found to be a monomolecular, formation of H2 and H2O bimolecular processes. The resulting mechanism may be described as follows:
