Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 143, Issue 3, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4927067
Keywords
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Funding
- Japan Society for the Promotion of Science (JSPS) [25288014, 15K13616, 25104005]
- Kurata Memorial Hitachi Science and Technology Foundation
- Research Foundation for Opto-Science and Technology
- Grants-in-Aid for Scientific Research [15K13616, 25288014] Funding Source: KAKEN
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Single-channel heterodyne-detected sum frequency generation (HD-SFG) spectroscopy for selectively measuring vibrational spectra of liquid interfaces is presented. This new methodology is based on optical interference between sum frequency signal light from a sample interface and phase-controlled local oscillator light. In single-channel HD-SFG, interferometric and spectrometric measurements are simultaneously carried out with an input IR laser scanned in a certain wavenumber range, which results in a less task than existing phase-sensitive sum frequency spectroscopy. The real and imaginary parts of second-order nonlinear optical susceptibility (chi((2))) of interfaces are separately obtained with spectral resolution as high as 4 cm(-1) that is approximately six times better than existing multiplex HD-SFG. In this paper, the experimental procedure and theoretical background of single-channel HD-SFG are explicated, and its application to the water/vapor interface is demonstrated, putting emphasis on the importance of a standard for the complex phase of chi((2)). (C) 2015 AIP Publishing LLC.
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