Tumbling of methyl radicals adsorbed on a silica gel surface studied by electron spin resonance
- 15 January 1968
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 46 (2) , 207-210
- https://doi.org/10.1139/v68-032
Abstract
The electron spin resonance spectra of CH3 and CD3 adsorbed on a silica gel surface at 77 °K are characterized by a marked dependence of the line width on nuclear spin quantum number. This dependence can be interpreted in terms of the tumbling of the radicals on the surface, anisotropies in the hyperfine and g tensors giving rise to a relaxation mechanism dependent on MI. A quantitative comparison of the spectra with the theory of this relaxation mechanism developed by McConnell, Kivelson, and Freed and Fraenkel enables the tumbling frequencies, 2.0 × 107 s−1 and 1.3 × 107 s−1 for CH3 and CD3 respectively, to be determined.Keywords
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