Nondissipative Absorption of Energy in the High-Frequency Linear Response of Liquids

Publisher Website
Google Scholar
Abstract
The shape of the vibration-rotation absorption band of a diatomic molecule dissolved in a dense fluid is studied using a memory-function formalism. In the limit that the vibrational-resonance frequency is large compared with the characteristic relaxation frequencies of the fluid, it is found that: (a) The band shape is determined by the power spectrum of the dipolar autocorrelation function, and (b) the vibrational-frequency shift is related to the mean-square acceleration of the intermolecular displacement. Moreover, it is shown that this shift is related to the existence of high-frequency nondissipative modes in the fluid. It is concluded that the driven oscillator can transfer energy to the fluid nondissipatively.

This publication has 2 references indexed in Scilit: