The Interchange of Translational and Vibrational Energy in an Asymmetric Molecular Potential Field

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Abstract
Reflection coefficients are calculated for a matter wave in a parabolic channel and in a square channel, each channel closed at one end by a vertical plane tilted slightly from the normal to the axis of the channel. The number of collisions necessary to dissipate one quantum of vibrational energy is given in terms of λ=tanθ, where θ is the angular deviation of the plane end from the normal to the axis of the channel. Comparison with the data from measurements on sound dispersion shows good agreement for N2O and CO2. The temperature dependence of the average probability of transition per collision is compared with data for Cl2 and a mixture of Cl2 and CO.