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The double-resonance concept is extended to the situation of two coherently driven optical transitions that do not share a common level but are coupled by molecular collisions that tip the angular momentum vector while preserving the molecular velocity and the rotational energy. This collision-induced double resonance is observed as sharp resonances, free of Doppler broadening, and can be explained in the same order of perturbation theory as the ordinary double-resonance experiment. They appear as satellite lines accompanying the usual double resonance or Lamb-dip spectra.
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Brewer et al. (1974) studied this question.
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