Photodissociation of 1,4 diazine ~pyrazine! following 248 nm ~S2 S0! and 308 nm ~S1 S0! excitation has been studied by photofragment translational spectroscopy. While the latter wavelength was inefficient at generating reactive products, the former wavelength afforded a rich variety of fragments, the most translationally energetic being HCN carrying up to 36 kcal/mol. The implications of this reactive mechanism toward interpretation of vibrational energy transfer experiments from hot ground state pyrazine are considered. The absolute quantum yields f~248 nm, 27-A!50.4060.10, f~248 nm, 27-B!50.086.02, f~308 nm, 27-B8!50.0036.001 and the two corresponding translational energy distributions are presented.
Pyrazine: supercollisions or simple reactions? / Chesko, J. D.; Stranges, Domenico; Suits, A. G.; Lee, Y. T.. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - STAMPA. - 103:(1995), pp. 6290-6292. [10.1063/1.470408]
Pyrazine: supercollisions or simple reactions?
STRANGES, Domenico;
1995
Abstract
Photodissociation of 1,4 diazine ~pyrazine! following 248 nm ~S2 S0! and 308 nm ~S1 S0! excitation has been studied by photofragment translational spectroscopy. While the latter wavelength was inefficient at generating reactive products, the former wavelength afforded a rich variety of fragments, the most translationally energetic being HCN carrying up to 36 kcal/mol. The implications of this reactive mechanism toward interpretation of vibrational energy transfer experiments from hot ground state pyrazine are considered. The absolute quantum yields f~248 nm, 27-A!50.4060.10, f~248 nm, 27-B!50.086.02, f~308 nm, 27-B8!50.0036.001 and the two corresponding translational energy distributions are presented.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
