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We presented that the relaxation of n coupling molecules in a molecularstring exhibits n individual relaxation modes (RMs), each mode beingcharacterized by a definite relaxation time and amplitude according to thestring model. The n RMs behaving a single relaxation at high temperature,evolves to two relaxation species, at low temperature, with differenttemperature dependences for the respective relaxation times and amplitudes.Since the characteristics of the two relaxation species are in agreement withthose exhibited by the universal alpha- and Johari-Goldstein (JG)beta-relaxations in glass dynamics, we provided a unified molecular levelmechanism for these two processes.

A unified molecular level mechanism for the universal alpha- and Johari-Goldstein beta-relaxations in glassformers