Abstract
Although chlorofluorocarbons are chemically very stable, they are easily photolysed by the excitons of a noble-gas matrix. The reaction products Cl and CF 2 can be followed in fluorescence and absorption spectroscopy, respectively. Our results on halogenated methanes (HM) in an Ar matrix show that (i) Cl is photolysed as an atom, (ii) CF 2 is a thermally and photolytically stable radical in the matrix, and (iii) the electronic energies of the CF 2 transition are strongly dependent on the matrix cage or on the split-off molecules, while the vibronic energies and the configuration coordinate remain nearly unchanged.
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