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D. P. LIN, P. HAMLET, AND L. KEVAN
and T2are used simultaneously and (2) the same relaxation mechanism is supposed to control both relaxation times. It has been shown that under these conditions and a t high temperature, T1 and TP appear to be ruled by a pseudo-isotropic diffusion of protons with respect to paramagnetic centers (Fe3+). Further work is in progress in order to try to answer various questions such as (1) the influence of para-
magnetic impurities content, (2) the influence of sample conditioning, and finally (3) the influence of the extent of decationation and dehydroxylation.
Acknowledgment. We wish to thank Dr. H. Resing of the U. S. Naval Research Laboratory, Washington, D. C., for stimulating discussions and Mr. M. Bulens for determinations of the second moment.
Paramagnetic Relaxation Study of Spatial Distribution of Trapped Radicals in &radiated
Alkaline Ice and Organic Glasses at 4.2OK
by D. P. Lin, Peter Hamlet, and Larry Kevan" Department of Chemistry, Wayne State University, Detroit, Michigan 48202
(Received January 8,1072)
Publication costs assisted by the U . S . Atomic Energy Commission
The spatial distribution of trapped radicals in 7-irradiated 10 M NaOH (alkaline ice), 2-methyltetrahydrofuran (MTHF), and triethylamine (TEA) has been studied at 4.2"K by measuring the characteristic paramagnetic relaxation time vs. radiation dose. Radical spur radii of
