Modulated Double Resonance and Inelastic Collisions

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Abstract
Microwave, infrared, and optical double‐resonance techniques have been developed recently to give highly specific information about rotational, vibrational, and electronic energy transfer in gases. We develop here a quantitative theoretical basis for the understanding of these results in terms of the inelastic collisions between molecules. A general formula is derived for the strength and phase shift of double‐resonance‐modulated lines produced by collisional transfer, and a number of qualitative trends are explained and predicted.

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