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State to State Photodissociation Experiments in Pulsed Nozzle Beams
Peter Andresen,
Peter Andresen
Max-Planck-Institut für Strömungsforschung, Böttingerstraße 4–8, D-3400 Göttingen, FRG
Search for more papers by this authorPeter Andresen,
Peter Andresen
Max-Planck-Institut für Strömungsforschung, Böttingerstraße 4–8, D-3400 Göttingen, FRG
Search for more papers by this authorAbstract
The photodissociation of jet cooled H2O in the first absorption band is studied at 157 nm with an F2 excimer laser. The nascent OH product state distributions are analyzed by LIF. A highly selective, strong j-dependent Λ-doublet population is found. A quantitative explanation of the A-doublet selectivity is given in terms of orientation effects of the unpaired pπ-lobe in OH. The strong inversion between the Λ-doublet states yields a pumpmechanism for astronomical OH-masers.
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