High-resolution sum-frequency generation from alkylsiloxane monolayers |
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Authors: | B.C. Chow T.T. Ehler T.E. Furtak |
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Affiliation: | (1) Center for Fiber-Optic Testing, Corning Incorporated, Corning, NY 14831, USA, US;(2) Chemistry Department, Buena Vista University, Storm Lake, IA 50588, USA, US;(3) Physics Department, Colorado School of Mines, Golden, CO 80401, USA, US |
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Abstract: | During the last decade, infrared optical sum-frequency generation (SFG) has been demonstrated to be a valuable technique for acquiring vibrational spectra of molecules at interfaces. However, the instrumentation that most frequently has been employed, which is based upon picosecond-scale pulse-width lasers, is fundamentally limited in the spectral resolution that can be achieved (typically ∼6 cm-1). We have optimized an older technology, based on a nanosecond-scale pulse-width laser, which enables the infrared frequency to be specified to within 0.2 cm-1. Exploiting this advantage, we have observed previously unrecognized features in the SFG spectrum of self-assembled monolayers. We demonstrate this through experiments performed on rubbed octadecylsiloxane (ODS) on glass, a system of considerable importance in liquid-crystal-display technology. Received: 14 August 2001 / Revised version: 15 January 2002 / Published online: 14 March 2002 |
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Keywords: | PACS: 42.65.Ky 68.43.Pq 82.80.Gk |
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