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https://hdl.handle.net/2440/68435
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Type: | Journal article |
Title: | The dynamics of evaporation from a liquid surface |
Author: | Maselli, O. Gascooke, J. Lawrance, W. Buntine, M. |
Citation: | Chemical Physics Letters, 2011; 513(1-3):1-11 |
Publisher: | Elsevier Science BV |
Issue Date: | 2011 |
ISSN: | 0009-2614 |
Statement of Responsibility: | Olivia J. Maselli, Jason R. Gascooke, Warren D. Lawrance and Mark A. Buntine |
Abstract: | We explore the collisional energy transfer dynamics of benzene molecules spontaneously evaporating from an in vacuo water-ethanol liquid beam. We find that rotations are cooled significantly more than the lowest-energy vibrational modes, while the rotational energy distributions are Boltzmann. Within experimental uncertainty, the rotational temperatures of vibrationally-excited evaporating molecules are the same as the ground state. Collision-induced gas phase energy transfer measurements reveal that benzene undergoes fast rotational relaxation, from which we deduce that the rotational temperature measured in the evaporation experiments (200-230 K) is an indication of the translational energy of the evaporate. Conversely, vibrational relaxation of the high frequency mode, ν6, is very inefficient, suggesting that the ν6 temperature (260-270 K) is an indication of the liquid surface temperature. Modelling of the relaxation dynamics by both 'temperature gap' and 'Master Equation' approaches indicates that the equivalent of 150-260 hard-sphere collisions occur during the transition from liquid to vacuum. © 2011 Elsevier B.V. All rights reserved. |
Rights: | Copyright 2011 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.cplett.2011.06.010 |
Description (link): | http://www.sciencedirect.com/science/journal/00092614 |
Published version: | http://dx.doi.org/10.1016/j.cplett.2011.06.010 |
Appears in Collections: | Aurora harvest Chemistry and Physics publications |
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