Abstract
When a pulsed gas dynamically cooled supersonic molecular flow interacts with solid surface a cold shock wave is formed in front of it, non-equilibrium conditions in which may be `reverse' to those in the incident (unperturbed) flow. Isotopically selective infrared multiphoton dissociation of SF 6 in the cold shock wave was studied. Anomalously a large increase (more than one order of magnitude) of the yield of products was found, as compared with the case of excitation of SF 6 in unperturbed flow, without essential decrease of the selectivity of process.
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