The hydration of urea via hydrogen-bond formation was found to have a significant effect on the observed Raman band shapes. An analysis indicates that, on the average, one molecule of water is carried along with a solute molecule during its reorientational motion (τR≊2.5 ps). Vibrational dephasing of the ν4 vibration (τω≊0.2 ps) is independent of concentration and appears to decrease slightly with increasing temperature. No evidence of urea dimer formation was detected.
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Hoccart et al. (1993) studied this question.
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