PARAMETERS OF QUASI-LOCAL LOW-FREQUENCY VIBRATIONAL MODES IN GLASSES: MEASUREMENT BY PHOTON ECHO TECHNIQUE AND SINGLE-MOLECULE SPECTROSCOPY

摘要

A comparative analysis of the results of experimental investigation of quasi-local low-frequency vibrational modes in an amorphous polymer by single-molecule spectroscopy and photon echo technique at low temperatures was performed. It was shown that the individual parameters low-frequency modes in an amorphous polymer have a pronounced spread. This fact can be considered as a direct proof of the localized nature of low-frequency modes in polymer glasses.