Premium
Photofragment Translational Spectroscopy of Fluorinated Halomethanes
Author(s) -
Felder Peter,
Yang Xuefeng,
Baum Georg,
Huber Robert
Publication year - 1994
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.199400007
Subject(s) - chemistry , photodissociation , radical , photochemistry , dissociation (chemistry) , spectroscopy , excited state , primary (astronomy) , bond dissociation energy , atomic physics , organic chemistry , physics , quantum mechanics , astronomy
The primary and secondary dissociation processes of CF 2 Br 2 and CF 2 BrI have been studied by photofragment translational spectroscopy in a pulsed molecular beam. The photolysis of CF 2 Br 2 at 193 nm produces mainly the fragment pair CF 2 Br + Br and, in a competing primary process, CF 2 + Br 2 . The CF 2 Br radicals are formed with sufficient internal energy to overcome the barrier of the unimolecular secondary dissociation to CF 2 + Br. The photodissociation of CF 2 BrI at 248 nm also proceeds along two decay pathways involving the fission of the weak C‐I bond and the stronger C‐Br bond, respectively. The former reaction produces spin‐orbit excited iodine atoms I( 2 P 1/2 ) and stable CF 2 Br radicals, whereas the latter reaction produces unstable CF 2 I radicals. The results of this study are compared with those of other workers, and an account of the ultraviolet photochemistry of fluorinated halomethanes is given.