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  • Title: Heterodyne-detected electronic sum frequency generation: "up" versus "down" alignment of interfacial molecules.
    Author: Yamaguchi S, Tahara T.
    Journal: J Chem Phys; 2008 Sep 14; 129(10):101102. PubMed ID: 19044899.
    Abstract:
    Heterodyne-detected electronic sum frequency generation (HD-ESFG) spectroscopy is newly developed to obtain complex electronic chi(2) spectra of interfaces for a simultaneous detection bandwidth broader than 100 nm. HD-ESFG provides linear chi(2) spectra that have unambiguous information on the "up" versus "down" alignment of interfacial molecules. It is demonstrated for p-nitroaniline, a prototypical molecule of nonlinear optical materials, that the up versus down alignment at an air/fused silica interface is critically influenced by a fine modification of the molecule.
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