2001
Ultrafast energy equilibration in hydrogen-bonded liquids
Publication
Publication
J. Phys. Chem. A , Volume 105 p. 1238- 1243
We have studied the equilibration dynamics of liquid water and alcohols following a local deposition of energy using time-resolved femtosecond mid-infrared pump-probe spectroscopy. The equilibration dynamics is monitored via the spectral response of the OH-stretch vibration. It is found that the equilibration leads to complicated changes of the absorption band of the OH-stretch vibration including a shift of the absorption band and a decrease of the absorption cross section. Interestingly, these spectral changes do not occur simultaneously, which indicates that they are associated with the equilibration dynamics of different low-frequency modes. For water, we find an equilibration time constant of 0.55 ± 0.05 ps. We observe that the equilibration time strongly increases going from water to alcohols such as methanol, ethanol, and propanol which means that water molecules can adapt much faster to a local deposition of energy than other hydrogen-bonding liquids.
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| doi.org/10.1021/jp003158e | |
| J. Phys. Chem. A | |
| Organisation | Ultrafast Spectroscopy |
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Lock, A. J., Woutersen, S., & Bakker, H. (2001). Ultrafast energy equilibration in hydrogen-bonded liquids. J. Phys. Chem. A, 105, 1238–1243. doi:10.1021/jp003158e |
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