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High yield of radical pairs in deuteratedn-alkane single crystals γ-irradiated at 4.2 K

✍ Scribed by Tomas Gillbro; Anders Lund

Publisher
Elsevier Science
Year
1975
Tongue
English
Weight
273 KB
Volume
34
Category
Article
ISSN
0009-2614

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✦ Synopsis

Following -r-irradiation at 4.2 K co. 40% of the rsdic& in an ~~-denne~ t3 crymtzl xe paired compared to ca 3% follow- ing irradiation at 77 K. Two structurally different kinds of radica! pairs have been observed. One kind is similar to that formed on irradiation at 74 K and shows a hyperfine spliiting of 2.5 G. The second kind shows no hyperfie structure and is thought to consist of two slightly differently oriented alkyl radicals that are trapped in the damaged regions of the crystzl Lttice. The distance between the rsdiczls in this kind OF pair is clustered around hvo values, namely I0.0k0.5 ;md 7.5iO.5 A. Tine value of 10 A is believed to be a good measure of the spur radius. The high yield of radical pairs at 4.2 K as compared to 77 K iscxplaincd by a mechanism where the excess excitation energy is trapped more efficiently at the origi-naI site of deposition at 4.2 K. This will also lead to less energy transfer to the surrounding molecules at 4.2 K.

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