Using multi-color femtosecond mid-infrared spectroscopy, we observe that the anisotropy dynamics of the O-D stretch vibration of HDO:H2O shows a strong dependence on the frequency of the excitation. The results indicate that a sub-ensemble of the molecules shows a fast reorientation that is accompanied by a large change of the vibrational frequency. In contrast to recent theoretical predictions [1,2], we find the probability for reorientation to be strongly frequency dependent.

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doi.org/10.1007/978-3-540-95946-5_163
Ultrafast Phenomena XVI. Springer Series in Chemical Physics, vol 92
Ultrafast Spectroscopy

Bakker, H., & Timmer, R. (2009). Frequency dependence of the molecular reorientation of liquid water. In Ultrafast Phenomena XVI. Springer Series in Chemical Physics, vol 92. doi:10.1007/978-3-540-95946-5_163