Local orientational order in liquids revealed by resonant vibrational energy transfer

We demonstrate that local orientational ordering in a liquid can be observed in the decay of the vibrational anisotropy caused by resonant transfer of vibrational excitations between its constituent molecules. We show that the functional form of this decay is determined by the (distribution of) angl...

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Bibliographic Details
Published in:Physical review letters 2014-11, Vol.113 (20), p.207801-207801, Article 207801
Main Authors: Panman, M R, Shaw, D J, Ensing, B, Woutersen, S
Format: Article
Language:English
Subjects:
Angle of reflection
Decomposition
Energy transfer
Ethanol
Ethyl alcohol
Hydrogen bonding
Liquids
Order disorder
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Summary:We demonstrate that local orientational ordering in a liquid can be observed in the decay of the vibrational anisotropy caused by resonant transfer of vibrational excitations between its constituent molecules. We show that the functional form of this decay is determined by the (distribution of) angles between the vibrating bonds of the molecules between which energy transfer occurs, and that the initial drop in the decay reflects the average angle between nearest neighbors. We use this effect to observe the difference in local orientational ordering in the two hydrogen-bonded liquids ethanol and N-methylacetamide.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.113.207801