Abstract

Persistent spectral hole-burning (PSIIB) and thermally induced hole refilling in the Shpol‘skii system perylene/n-heptane and in the amorphous regions of polyethylene (PE) doped with perylene provides a microscopic model of the physical nature of the asymmetric double-well potentials (ADWP), which are characteristic for amorphous systems and crystalline solids with local disorder [1]. These ADWP have been originally introduced in order to explain anomalous acoustic and thermal properties of amorphous materials by the socalled two level systems, the existence of which is due to tunneling in double-well potentials (DWP) with appropriate parameters. In connection with phonon detection by hole refilling, meassured after irradiation of nanosecond heat pulses, a model for photophysical PSHB was presented which is based on spectral jumps (matrix-shift variations) caused by crossing over the barriers of ADWP [2]. Recently spectral jumps have been observed for single molecules [3].

© 1992 Optical Society of America