Time-resolved relaxation of one- and two-vibron states in the rubidium perchlorate crystal

Abstract

The vibrational relaxation times of the ν 2 fundamental mode and the {2ν 2 + ν 1} = [Ω − + Ω +] Fermi doublet of the ClO the rubidium perchlorate crystal are investigated as a function of temperature between 7 and 300 K using high repetition-rate time-resolved picosecond laser techniques. The results show that the neighboring Ω − and Ω + transitions relax predominantly by up-conversion to the higher ν 3 level via scattering of a single lattice phonon, whereas the ν 2 state mainly decays to the relatively more distance upper ν 4 level by scattering of two lattice phonons.