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The translational diffusion coefficients (D) of N,N,N ,N -tetramethyl-p-phenylenediamine (TMPD) and its cation radical were measured by the transient grating method. The D value of the free cation radical is about twofold smaller than that of the neutral molecule. The D values of both species were calculated on the basis of the Stokes-Einstein (SE) relation, the Spernol-Wirtz modification of the...
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