Low energy activation processes in amorphous polymers - the case of selenium

We present an internal friction experiment in amorphous selenium at low frequency (30 kHz) and low temperature (4 K < T). Our results prove that, below the glass transition, there exists in amorphous selenium only one kind of thermal activated processes involving internal friction. We suggest that the underlying microscopic mechanisms are closely related to the polymeric amorphous structure and so should exist in any amorphous polymers.