Three different liquid interfaces, water/air, thiophene/air, and water/thiophene, were probed using the second harmonic generation (SHG) technique. Thiophene and water have been chosen because the hyperpolarizability of these molecules has already been measured or calculated and the different values can be found in literature. We have studied the microscopic structure of these interfaces by comparing the components of the second order susceptibility tensor determined from the SHG polarization curve analysis with those determined via a molecular dynamics (MD) simulation of these interfaces. We have indeed computed the structure and orientation of water and thiophene molecules at the liquid/air and liquid/liquid (L/L) interfaces as a function of the distance from the interface. The integrated susceptibility values calculated by MD simulations agree well with SHG results and validate the choice of force fields that should permit to quantify more complex L/L interfaces.
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14 April 2017
Research Article|
April 12 2017
Analysis of the second harmonic generation signal from a liquid/air and liquid/liquid interface
Thanh Tung Pham;
Thanh Tung Pham
1Institut de Chimie Séparative de Marcoule,
UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171
, 30207 Bagnols sur Cèze, France
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Alban Jonchère;
Alban Jonchère
1Institut de Chimie Séparative de Marcoule,
UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171
, 30207 Bagnols sur Cèze, France
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Jean-François Dufrêche;
Jean-François Dufrêche
1Institut de Chimie Séparative de Marcoule,
UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171
, 30207 Bagnols sur Cèze, France
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Pierre-François Brevet;
Pierre-François Brevet
2Institut Lumière Matière,
UMR CNRS 5306 and Université Claude Bernard Lyon 1
, 69622 Villeurbanne Cedex, France
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Olivier Diat
Olivier Diat
a)
1Institut de Chimie Séparative de Marcoule,
UMR 5257 (CEA, CNRS, Université de Montpellier, ENSCM), BP17171
, 30207 Bagnols sur Cèze, France
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a)
Electronic mail: olivier.diat@cea.fr
J. Chem. Phys. 146, 144701 (2017)
Article history
Received:
December 15 2016
Accepted:
March 24 2017
Citation
Thanh Tung Pham, Alban Jonchère, Jean-François Dufrêche, Pierre-François Brevet, Olivier Diat; Analysis of the second harmonic generation signal from a liquid/air and liquid/liquid interface. J. Chem. Phys. 14 April 2017; 146 (14): 144701. https://doi.org/10.1063/1.4979879
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