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The limiting models - rotational or fluctuational process - for electron spin relaxation of Mn 2+  in solution are discussed by comparison with dielectric correlation times. Free (solvated) ions presumably relax by the fluctuational, ionic complexes with static zfs by the rotational process. The latter conclusion requires the spectral density function to be more flat than the Debye function.

Dielectric Absorption and ESR Results on the Relaxation of some Manganese Complexes in Organic Solvents