Infrared multiphoton dissociation of CBrF2CHClF, CBrF2CHBrF, and CBrClFCBrF2in a molecular beam

摘要

Dynamics and mechanisms of infrared multiphoton dissociation of CBrF2CHClF, CBrF2CHBrF, and CBrClFCBrF2have been studied using a photofragmentation translational spectroscopy. All molecules dissociated through Cndash;Br bond rupture reactions. At high laser fluence, the halogenated ethyl radicals produced by the primary dissociation reactions dissociated through carbonndash;halogen bond ruptures. Centerhyphen;ofhyphen;mass product translational energy distributions for the Cndash;Br and Cndash;Cl bond ruptures of all halogenated ethanes and ethyl radicals studied are essentially consistent with those calculated by Ricendash;Ramspergerndash;Kasselndash;Marcus (RRKM) theory. This indicates that there exists essentially no exit channel barrier on the potential energy surface for the Cndash;Br or Cndash;Cl bond rupture of the halogenated ethanes and ethyl radicals. copy;1994 American Institute of Physics.