Abstract
Laser-induced chemical reactions can be based on several fundamentally different microscopic mechanisms. In the following we shall classify reactions into those which are governed by mainly pyrolytic (photothermal) or by mainly photolytic (photochemical) processes. We shall call a reaction pyrolytic if the thermalization of the laser excitation is fast compared to the reaction, and photolytic if this is not the case, i.e. when the constituents of the reaction are in nonequilibrium states. The laser excitation can take place within the ambient gaseous or liquid medium and/or directly within the surface of the solid material (substrate) to be processed. In many cases the different mechanisms and possibilities of excitation contribute simultaneously to the reaction, but often one of them dominates. There are also many examples where, for example, a reaction is initiated photolytically and proceeds pyrolytically, or vice versa.
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Bäuerle, D. (1986). Fundamental Excitation Mechanisms. In: Chemical Processing with Lasers. Springer Series in Materials Science, vol 1. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-02505-5_2
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