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    The dynamics of evaporation from a liquid surface

    Access Status
    Fulltext not available
    Authors
    Maselli, O
    Gascooke, J.
    Lawrance, W.
    Buntine, Mark
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Maselli, Olivia and Gascooke, Jason and Lawrance, Warren and Buntine, Mark. 2011. The Dynamics of Evaporation from a Liquid Surface. Chemical Physics Letters. 513 (1-3): pp. 1-11.
    Source Title
    Chemical Physics Letters
    DOI
    10.1016/j.cplett.2011.06.010
    ISSN
    00092614
    School
    Department of Applied Chemistry
    URI
    http://hdl.handle.net/20.500.11937/25892
    Collection
    • Curtin Research Publications
    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, m6, is very inefficient, suggesting that the m6 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.

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