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Formation of association ions in the photoionization of alkyl halides

✍ Scribed by L. W. Sieck; R. Gorden Jr.

Publisher
John Wiley and Sons
Year
1973
Tongue
English
Weight
483 KB
Volume
5
Category
Article
ISSN
0538-8066

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✦ Synopsis

The methyl and ethyl chlorides and bromides, as well as methyl iodide, were photoionizcd 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 CHaBr, CHBI, and C2H5Br, but not in the chlorides. Lower limits for the dissociative lifetimes of the ion-molecule collision complexes were estimated and are as follows: (CH3Br)z+, 1.6 ps; (CH31)2+, 1.9 p s ; and (CZHSBr)2+, 5.4 p s . An increase in photon energy (internal energy content of the reactant ion) decreases the dissociative lifetime of the collision complex in CHaI.

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