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  • Title: Compact broadband vibrational sum-frequency generation spectrometer with nonresonant suppression.
    Author: Lagutchev A, Lozano A, Mukherjee P, Hambir SA, Dlott DD.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2010 Apr; 75(4):1289-96. PubMed ID: 20129816.
    Abstract:
    A compact broadband vibrational sum-frequency spectroscopy (SFG) apparatus is described to study molecules at surfaces and interfaces. Using an étalon as the frequency narrowing device, the visible pulse has a time-asymmetric profile that allows the user to deeply suppress nonresonant background signals that hinder detection of molecular vibrational resonances. Several features of the spectrometer that, in aggregate, improve signal-to-noise ratios by a large factor are described. The spectrometer features a series of interchangeable prealigned sample holders for different applications. Examples of applications are presented where nonresonant suppression greatly improves the ability to study adsorbates on single-crystal surfaces as a function of rotation about the azimuth, and where the rapid data acquisition abilities of the spectrometer are used to study electrochemical transformations on single-crystal electrodes.
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