Fizika Nizkikh Temperatur: Volume 25, Number 8-9 (August 1999), p. 950-963 ( to contents , go back )
Formation and trapping of electron excitations in neon cryocrystals
I. Ya. Fugol, A. G. Belov, E. I. Tarasova, and E. M. Yurtaeva
B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47, Lenin Ave., 310164, Kharkov, Ukraine
(Received March 9, 1999 )
The paper reports the analysis of the specific features of exciton states in neon made in the approximation of a rigid lattice and with due account of its easy deformability. Regular alteration of the parameters of the atomic and molecular states in passing from heavy inert elements to light ones are discussed. The alterations give rise to a series of characteristic distinctions of band states in neon. The dynamic parameters of electrons, holes and excitons connected to the effects of resonance transfer of energy in a crystal, and to the processes of quasiparticle self-trapping are specified. It is shown that the strong coupling of the low-lying exciton states with local vibrations of the surrounding lattice results in a mixture of free and self-trapped excitations and in a considerable decrease in the mobility of excitons. The comparison of the experimental and calculated absorption spectra of the mixed states makes it possible to reestimate the parameters of the exciton-phonon interaction for singlet and triplet components of the exciton.