Topochemical classification

A topochemical classification of photochemistry at interface between solid and gas or solid and liquid illustrated schematically in Fig.1. In Fig.1, the signs etc. stand for the types of photochemical reaction at interfaces. The S l reaction implies that the electrons and/or positive holes produced in the inside of solid by light... 

One of the most important and fundamental questions in relation to the topochemical classification of Fig.1 is which contributes more to the a-Si nucleation, the gaseous phase photo decomposition or the decomposition of adsorbed molecules. The unambiguous answer to the question can be derived if we could eliminate illumination to the substrate surface without affecting excitation of gaseous phase molecules. Though it is hard to realize such a situation with the diffuse light, a similar... 

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