Articles you may be interested inCompetition between photochemistry and energy transfer in ultraviolet-excited diazabenzenes. I. Photofragmentation studies of pyrazine at 248 nm and 266 nm Vibrational population distributions in the v 2 out-of-plane bending mode of CH when produ d b photofragm~ntati~n ~f CH3I at 266 and 248 nm are analyzed by infrared emissio: spectroscopy.~n ~th cases, there IS excItatIon of the "umbrella" mode vibration up to 10 quanta, and the peak of the excitation occurs at v 2 = 2 f?r both :wavelengths. The vibrational distribution produced at 266 nm agrees well with molecul~r . beam tlme-o~-fllght results. The distribution at 248 nm is only moderately enhanced, in contradIctIOn to theoretical predictions which suggest that the peak of the distribution should be shifted to v 2 = 5. The i~frared e~ission spectra suggest that there is no additional rotational excitation in the radical over th~ am~lent rotational temperature of the parent CH3I. In addition, there is no detectable excitation in other VIbrational modes, produced either directly in the dissociation or upon collisions. 4766

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