Infrared–Ultraviolet Sum-Frequency Generation Spectrometer with a Wide Tunability of the Ultraviolet Probe

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Abstract:

We have constructed a multiplex infrared–ultraviolet (IR-UV) sumfrequency generation (SFG) spectrometer that has a wide tunable range (235–390 nm) of the UV probe wavelength. The tunable UV probe was obtained by doubling the signal output of an optical parametric amplifier pumped by a 400 nm picosecond pulse. A prism monochromator was used as a tunable sharp-cut bandpass filter to reduce stray light due to the scattering of the UV probe so that any wavelength within the tunable range can be chosen as that of the UV probe. The SFG spectra of p-mercaptobenzoic acid on a gold substrate was measured with 289 and 334 nm UV probes. The SFG vibrational band intensities due to the carbonyl stretch mode and a phenyl ring stretch mode measured with the 289 nm probe were approximately three times larger than those measured with the 334 nm probe. The enhancement was ascribed to an electronic resonant effect.

Keywords: DOUBLY RESONANT SFG; DR-SFG; INFRARED-ULTRAVIOLET SUM-FREQUENCY GENERATION; IR-UV SFG; SAM; SELF-ASSEMBLED MONOLAYER

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370207780807812

Affiliations: Center for Quantum Life Sciences and Department of Chemistry, Graduate School of Science, Hiroshima University, Kagamiyama, Higashi-Hiroshima 739-8526, Japan; Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Honmachi, Kawaguchi, 332-0012, Japan

Publication date: May 1, 2007

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