The Influence of the Dipole-Dipole Interactions on the Phonon Induction

Abstract

Abstract It is shown that the none quilibrium state of the dipole-dipole reservoir in paramagnetic and paraelectric systems can stimulate the generation of the coherent spontaneous radiation essentially. At the same time the uncoherent spontaneous radiation and coherent induced (in the Einstein sense) radiation canN′t be amplified in this conditions essentially. Moreover the electromagnetic and acoustic maser-effects and uncoherent apontaneous radiation completely disappear in the limit case of enough small absolute values of the dipole-dipole system (DDS) temperature. The nuclear polarization is also absent at enough low absolute electron-nuclear and nuclear-nuclear DDS temperatures. All of these consequences follow from the obvious trace property of the product of n-particle density matrix operators and operators of observable quantities constituted from m-particle operators: this trace is identically equal to zero if m > n (all n or m particles are different).