Electron spin resonance linewidths have been measured at 7 MHz for Cs, Rb, K, and Li solutions from 0.03 mole literminus;1to about 1 mole literminus;1. Linewidths increase in the order Li, KRbCs; the widths of Li solutions are essentially the same as those found for K. Correlation times of the hyperfine and spinndash;orbit interactions for the unpaired electron spins are calculated for K from very dilute solutions to 1.0 mole literminus;1and are compared with a theoretical expression previously proposed. From this comparison it is found that the meanhyphen;square flight distance associated with the conductivity increases by a factor of 3 from very dilute solutions to 0.6 mole literminus;1and is indicative of the onset of exchange processes in the conductivity. The magnitude of the spinndash;orbit relaxation is discussed and the much larger observed linewidths for Cs and Rb compared to K are interpreted.
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