Ultrafast Raman echo experiments in the liquid phase

摘要

The Raman echo experiment, which can distinguish homogeneous and inhomogeneous broadening of vibrational spectra, is reported for the first time in liquids. The symmetric methyl stretch of acetonitrile, which has been extensively studied with contradictory results, is shown to be homogeneously broadened. The vibration interacts only with rapid collisional motions of the solvent.