ULTRASONIC RESONANCE AND RELAXATION IN RBCL-OH

The change of elastic constants and mechanical loss from [100] elastic dipoles are calculated on the basis of a six level tunneling model. R esonance and relaxation mechanisms are treated together, and expressio ns for C'- and C-11- sound modes are given. The results are used to an alyse experimental data for the RbCl:OH system. The low temperature ul trasonic attenuation is attributed to the resonance mechanism, and the frequency and the concentration dependence are interpreted in terms o f dynamical and static interaction between dipoles.