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The optical analog of pulse Fourier-transform NMR spectroscopy is demonstrated. Doppler-free infrared spectra are obtained for a set of closely spaced ¹³CH₃F transitions at 9.66 {μ}m from two-pulse echo and free-induction decay transients. The effects of elastic or inelastic collisions on the decay rate are obtained for each transition, and the long-range force laws are deduced from the dependence of the scattering cross section on molecular velocity.
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Grossman et al. (1977) studied this question.
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