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Formation of association ions in the photoionization of alkyl halides
Author(s) -
Sieck L. W.,
Gorden R.
Publication year - 1973
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.550050313
Subject(s) - chemistry , photoionization , halide , methyl iodide , ion , mass spectrometry , alkyl , iodide , ethyl iodide , molecule , photochemistry , medicinal chemistry , analytical chemistry (journal) , inorganic chemistry , organic chemistry , ionization , chromatography
The methyl and ethyl chlorides and bromides, as well as methyl iodide, were photoionized in the vacuum ultraviolet at 300 K in a mass spectrometer over the pressure range 0.5 to approximately 100 millitorr. Under these conditions, stabilized parent ion dimers are found in CH 3 Br, CH 3 I, and C 2 H 5 Br, but not in the chlorides. Lower limits for the dissociative lifetimes of the ion–molecule collision complexes were estimated and are as follows: (CH 3 Br) 2 + , 1.6 μs; (CH 3 I) 2 + , 1.9 μs; and (C 2 H 5 Br) 2 + , 5.4 μs. An increase in photon energy (internal energy content of the reactant ion) decreases the dissociative lifetime of the collision complex in CH 3 I.