Vibrational Energy Transfer in Mixtures of Gases

Abstract

RECENTLY, Lambert et al.1 have reported ultrasonic dispersion in mixtures of SF6+CHClF2 possessing near-resonant vibrational modes. The measurements show a single dispersion with the reciprocal relaxation time (1/τ) varying non-linearly with the molar composition (approximately quadratic dependence of reciprocal relaxation time on molar concentration). A similar behaviour is shown by the C2H4+C2H6 system examined by Valley and Legvold2. Lambert et al.1 have interpreted their observations on the basis of a rapid process of vibration to vibration energy transfer which is followed afterwards by a vibration to translational energy transfer process.