Theory of vibrational relaxation and infrared absorption in condensed media

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Abstract
In this paper, we develop a theoretical model for vibrational relaxation of vibrons in condensed media based on the breakdown of the adiabatic separation of vibron (high frequency) and phonon (low frequency) motion. The conditions under which the adiabatic approximation of the vibron–phonon system is valid are examined. The present model is also applied to the ir absorption in condensed media; the band shape function and the dipole correlation function are obtained. The relation between the vibrational relaxation and the ir absorption is discussed.