Abstract
A temporally two-dimensional overtone vibrational dephasing spectroscopy, which is based on the fifth-order nonlinearity, is proposed to investigate correlation between fluctuations of different vibrational frequencies in liquids. The experiment is done for the C--D stretching of neat ${\mathrm{CDCl}}_{3}$ liquid. We found that a signal decay as a function of the second-pulse interval gets faster as the first-pulse interval increases.
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