the exceptionally large C-H bond strength of the corresponding alkanes, but when bond strength differences are more similar, as in the C3 and C4 alkenes, it becomes more difficult to predict the occurrence of surface-generated gas-phase radicals.Acknowledgment. We express appreciation to Drs. J. C. Evans and C. C. Rowlands of Univeristy College, Cardiff, for the EPR simulation program. The research was supported by the Division of Basic Energy Sciences, Department of Energy.A Study by Solid-State NMR of 133Cs and 1H of a
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