Intermolecular motion in CS₂ and benzene is investigated by femtosecond nonresonant four- and six-wave mixing. Impulsive stimulated six-wave mixing yields new information on dephasing of coherent nuclear motion, not accessible from four-wave mixing experiments. The results cannot be modeled by two independent harmonic modes accounting for coherent librations and rotational diffusion.
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Steffen et al. (1996) studied this question.