Selective Laser-Induced Heterogeneous Chemistry on Surfaces
The effects of laser radiation on the heterogeneous catalytic processes depend upon the nature of the surfaces, the electronic and vibrational structures of the adspecies/surface system, and the characteristics of the laser beam. Depending upon the chemical and physical states of the excited species, there are several ways in which laser radiation can influence the heterogeneous processes. In the past few years, at least three types of laser-stimulated surface processes have been reported: 1) laser excitation of reactants in the gas phase located in the volume above the surface. The laser radiation was used to overcome or compensate the reaction barrier, thus the rate of laser-catalyst chemistry was enhanced [1–3]; 2) Laser excitation of reactants adsorbed on a solid surface. Djidjoev et al. showed that the actions of laser radiation on the adsorbed molecules, such as hydroxyl groups and amino groups NH2 and NH on silica surfaces, are quite different from oven heating.
KeywordsHydroxyl Chemisorption Kato Photooxidation Wolfram
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