Primary product channels in the photodissociation of methane at 121.6 nm

Autor:	Rn Dixon, David H. Mordaunt, Ludger Schnieder, K. H. Welge, Gregory P. Morley, Colin M. Western, Michael N. R. Ashfold, I. R. Lambert
Rok vydání:	1993
Předmět:	Internal conversion Internal energy Chemistry Stereochemistry Atom Photodissociation General Physics and Astronomy Molecule Physical and Theoretical Chemistry Kinetic energy Photochemistry Spectroscopy Excitation
Zdroj:	The Journal of Chemical Physics. 98:2054-2065
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.464237
Popis:	The technique of H(D) atom photofragment translational spectroscopy has been applied to the photodissociation of CH4(CD4) at 121.6 nm. Contrary to the previous consensus view, we find simple C–H bond fission to be the dominant primary process following excitation at this wavelength. The resulting CH3 fragments are formed with very high levels of internal excitation: Some (∼25%) possess so much internal energy that they must undergo subsequent unimolecular decay. The present experiments do not provide a unique determination of the products of this secondary decay process, but statistical arguments presented herein suggest that they will be predominantly CH and H2 fragments. Similar considerations point to a significant role for the direct three body process yielding the same products H+H2+CH. This overall pattern of energy disposal can be rationalized by assuming that most of the initially prepared CH4(A 1T2) molecules undergo rapid internal conversion (promoted by the Jahn–Teller distortion of this excit...
Databáze:	OpenAIRE
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