The dynamics of evaporation from a liquid surface
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. With...
| Main Authors: | , , , |
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| Format: | Journal Article |
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Elsevier
2011
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| Online Access: | http://hdl.handle.net/20.500.11937/25892 |
| _version_ | 1848751832431591424 |
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| author | Maselli, O Gascooke, J. Lawrance, W. Buntine, Mark |
| author_facet | Maselli, O Gascooke, J. Lawrance, W. Buntine, Mark |
| author_sort | Maselli, O |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T07:58:59Z |
| format | Journal Article |
| id | curtin-20.500.11937-25892 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:58:59Z |
| publishDate | 2011 |
| publisher | Elsevier |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-258922017-09-13T15:55:38Z The dynamics of evaporation from a liquid surface Maselli, O Gascooke, J. Lawrance, W. Buntine, Mark 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. 2011 Journal Article http://hdl.handle.net/20.500.11937/25892 10.1016/j.cplett.2011.06.010 Elsevier restricted |
| spellingShingle | Maselli, O Gascooke, J. Lawrance, W. Buntine, Mark The dynamics of evaporation from a liquid surface |
| title | The dynamics of evaporation from a liquid surface |
| title_full | The dynamics of evaporation from a liquid surface |
| title_fullStr | The dynamics of evaporation from a liquid surface |
| title_full_unstemmed | The dynamics of evaporation from a liquid surface |
| title_short | The dynamics of evaporation from a liquid surface |
| title_sort | dynamics of evaporation from a liquid surface |
| url | http://hdl.handle.net/20.500.11937/25892 |