Time‐Correlation Function of Molecular Random Motion and Shape of Spectral Bands

摘要: It is shown that there a close relation between the spectral density of Brownian motion and band shape spectrum related to general excitation‐response process, time‐correlation functions molecular system are obtained from observed spectra. The correlation function for rotational considered theoretically. Two limits motion—the inertial limit Debye limit—are conveniently assumed. In limit, composed two different parts, owing discrete nature fluid in which molecules immersed. first part gives broadening second narrowing. infrared chosen as an illustration, because it provides simple functions. Consequently, theory presented terms function. gen...