Abstract
A time-domain method for calculating polarized Raman and two-dimensional infrared (2D-IR) spectra that includes the effects of both the diagonal frequency modulations (of individual molecules in the system) and the off-diagonal (intermolecular) vibrational coupling is presented. It is then applied to the case of the amide I band of liquid N, N-dimethylformamide. The non-coincidence effect in the polarized Raman spectrum and the corresponding spectral feature in the 2D-IR spectrum related to the off-diagonal vibrational coupling and delocalization of vibrational modes are discussed.
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