The dynamics of evaporation from a liquid surface
|dc.identifier.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.|
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.
|dc.title||The dynamics of evaporation from a liquid surface|
|dcterms.source.title||Chemical Physics Letters|
|curtin.department||Department of Applied Chemistry|
|curtin.accessStatus||Fulltext not available|