Fig. 4. Set of 2D IR spectra of the OD stretch of 5% HOD in H2O for population times (t2) specified in the upper right corner of each spectrum. (a) All parallel measurement (XXXX) (b) Polarization measurements (YXXY). Spectral diffusion, which is revealed by the tilt of the bleaching signals highlighted by the white dotted line, decays in the sub-picosecond time scale.
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