Ultrafast Raman echoes in liquid acetonitrile

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Abstract
Raman echoes are observed for the first time in the liquid phase. The symmetric methyl stretch of acetonitrile is shown to be homogeneously broadened, in disagreement with time-resolved coherent Raman scattering experiments and recent theory, but in agreement with line-shape studies and computer simulations. The vibration interacts primarily with rapid, collisional solvent motions, not with long-lived structural features.