Itinerant oscillator model. Evaluation using experimental results for the disordered solid 1,2,3-trichlorotrimethyl benzene

Abstract

By consideration of a suitable approximation to the Liouville equation it is shown analytically that in the disordered solid state of 1,2,3-trichlorotrimethyl benzene (TCTMB) the total zero to THz loss profile consists of two peaks separated by many decades of frequency. Neither the low frequency nor THz loss peaks should be modelled independently, as has been the practice in the past. The molecular dynamics may be represented by physically interpreting the particular Mori approximant we have used. This may be achieved either in terms of the itinerant librator or in terms of dipole–dipole coupling.