Vibrational energy relaxation of highly compressed N2–D2 mixtures

Abstract
Vibrational energy relaxation time T1 of nitrogen in highly compressed mixtures of D2–N2 has been measured at room temperature as a function of gas density and mixture ratio. The first vibrational state of N2 has been populated by a rapid V–V transfer from D2 which has been vibrationally excited by collision‐induced absorption. The decay of the N2 vibrational excited population has been time resolved by monitoring the infrared collision‐induced fluorescence. The data are compared with attractive hard‐sphere models developed for energy relaxation in dense fluids.