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The anelastic spectrum of calix[4]arene was measured at two differentvibrational frequencies. Three thermally activated peaks were detected. Thelowest temperature peak can be described considering a continous distributionfunction of activation energies for the relaxation. This anelastic peak can beascribed to a thermally activated hopping process of H atoms of the OH groups,corresponding to a flip-flop of the OH bond. From the results of the presentstudy, it seems that anelastic spectroscopy is a good experimental technique tostudy atomic motion inside molecules at a mesoscopic (few molecules) level.Comment: 5 pages, 4 figures, submitted to Phys. Rev.

Incoherent thermally activated proton hopping process in calix[4]arene observed by anelastic spectroscopy