ANOMALOUS HOLE SPECTRA OF CHLORIN-DOPED LOW-TEMPERATURE GLASSES

Spectral holes have been measured for chlorin dopant educt and photopr oduct states in six disordered systems: in glasses of o-terphenyl, ben zophenone, polystyrene, ethanol, and triethylamine and on the surface of Al2O3 powder at 5 K. In contrast to the conventional picture of zer o-phonon holes and phonon sideholes observable in the educt state, no zero-phonon hole is observable in the photoproduct state in glasses ye t the absorption spectra exhibit a peculiarity resonant with the burni ng frequency (''Lambda-spectra''). A more complicated superpositional picture has been observed for Al2O3 powder The low-temperature hole sp ectra of an impurity in a 1D elastic lattice have been calculated and demonstrated to match qualitatively well the experimental observations . Physical relevance of such a model is discussed.