title: Zero-phonon lines of systems with different dimensions and unconventional vibronic interactions.
abstract: The standard theory of the optical spectra of impurity centres in solids predicts the Lorentzian shape of the zero-phonon lines to have temperature-dependent position and width. However, in recent years different systems, including ones of reduced dimension, have been found, in which remarkable deviations from the standard laws have been observed. Generalizations of the theory to these systems are presented. Among other things, the quantum liquid 3He doped by optical centres is considered.
authors.affiliation: Institute of Physics, University of Tartu, Tartu, Estonia. hizh@fi.tartu.ee
authors.forename: V
authors.initials: V
authors.lastname: Hizhnyakov