RELAXATION AND HOT LUMINESCENCE IN SOLID XE

A theoretical description of multiphonon decay processes of highly exc ited localized modes is presented. Slowing of the decay rate at large vibration amplitudes and jumps in the relaxation rate at certain criti cal amplitudes are predicted. Highly excited vibrational states can ap pear in localized excitons in crystals of noble gases and can also app ear in hot luminescence. The observed and calculated spectra of Xe-2 in a Xe crystal are compared. (C) 1998 American Institute of Physics.