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We provide broadband dielectric loss spectra of glass-forming glycerol withvarying additions of LiCl. The measurements covering frequencies up to 10 THzextend well into the region of the fast beta process, commonly ascribed tocaged molecule dynamics. Aside of the known variation of the structural alpharelaxation time and a modification of the excess wing with ion content, we alsofind a clear influence on the shallow loss minimum arising from the fast betarelaxation. Within the framework of mode-coupling theory, the detectedsignificant broadening of this minimum is in reasonable accord with the foundvariation of the alpha-relaxation dynamics. A correlation betweenalpha-relaxation rate and minimum position holds for all ion concentrations andtemperatures, even below the critical temperature defined by mode-couplingtheory.

Ions in glass forming glycerol: Close correlation of alpha and fast beta relaxation