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Zusammenfassung
Ph radicals were generated by photo-decompn. of nitrosobenzene isolated in solid Ar at 12 K. In this medium the origin of the 1st UV absorption band of nitrosobenzene corresponding to the S0 -> S2 transition was found at 30,260 cm-1. Excitation with an excess energy of ~2200 cm-1 results in very efficient photodissocn. The fragments NO and Ph are stable for many hours. Annealing of the sample >35 ...
Zusammenfassung
Ph radicals were generated by photo-decompn. of nitrosobenzene isolated in solid Ar at 12 K. In this medium the origin of the 1st UV absorption band of nitrosobenzene corresponding to the S0 -> S2 transition was found at 30,260 cm-1. Excitation with an excess energy of ~2200 cm-1 results in very efficient photodissocn. The fragments NO and Ph are stable for many hours. Annealing of the sample >35 K led to partial recombination and recovery of the absorption spectrum of nitrosobenzene. The UV spectrum of the Ph radical was obtained in the wavenumber range 25,000-45,000 cm-1, apparently without contamination by other species. It shows sharp lines at 25,220, 33,880, and 34,820 cm-1 and 2 broader maxima at 38,360 and 41,060 cm-1. Of these only the line at 34,820 cm-1 was assigned to the Ph radical in earlier work. These data were compared to recent MO calcns.
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