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A STUDY OF FREE RADICALS AND OTHER INTERMEDIATE SPECIES AND INTERNAL ENERGY TRANSFER PROCESSES IN IRRADIATED CHEMICAL SYSTEMS
AERONAUTICAL SYSTEMS DIV WRIGHT-PATTERSON AFB OHIO
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The role of internal energy transfer processes in radiation chemical reactions involving free radicals and other intermediate species, usingA SERIES OF ALKYL IODIDES WITH DIFFERENT CARBON CHAIN LENGTHS AS THE EXPERIMENTAL SYSTEMS IS STUDIED. It was found that, 1 with increasing size of the alkyl group in a homologous series, the extent of C-I bond rupture decreases regularly, whereas both the H2 and HI yields increase 2 products with practically identical yields are formed in the radiolyses of two systems with similar elemental compositions, one consisting of pure C16H33I, and the other an equimolecular mixture of C8H18 and C8H17I. Analysis of these results, shows that energy initially localized elsewhere in an alkyl iodide molecule cannot efficiently cause C-I bond breakage despite the latters low bond strength, i.e., internal energy transfer does not play an important role in these reactions. Instead, it is concluded that the product yields are dependent on the effective electron fractions of the various groups in the irradiated system. Author
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