14 May 1992 Molecular orientation at interfaces as studied by optical second-harmonic generation
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The nonlinear optical process of second harmonic generation (SHG) is an inherently surface sensitive technique for studying the interface of two centrosymmetric media. This surface selectivity has led to its application as an in situ probe of chemisorption, molecular orientation, and adsorbate organization at interfaces. This paper describes the use of resonant SHG to measure molecular adsorption and orientation at solid-air, solid-liquid, and liquid-liquid surfaces. The polarization and phase dependence of the resonant SHG from molecules at these surfaces can be related to the average molecular orientation at the interface. Perturbation theory calculations using pi-electron wavefunctions are used to identify the molecular nonlinear polarizability tensor elements required in the orientation calculation.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert M. Corn, Robert M. Corn, } "Molecular orientation at interfaces as studied by optical second-harmonic generation", Proc. SPIE 1636, Applied Spectroscopy in Materials Science II, (14 May 1992); doi: 10.1117/12.59303; https://doi.org/10.1117/12.59303

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