Infrared—Ultraviolet Sum-Frequency Generation Spectrometer with a Wide Tunability of the Ultraviolet Probe
Infrared—Ultraviolet Sum-Frequency Generation Spectrometer with a Wide Tunability of the Ultraviolet Probe
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DOI：
10.1366/000370207780807812
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发表时间：
2007-05
影响因子：
3.5
通讯作者：
Toshiki Maeda;T. Ishibashi
中科院分区：
文献类型：
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作者：
Toshiki Maeda;T. Ishibashi
我们已经建立了一个多路红外-紫外（IR-UV）和频发生（SFG）光谱仪，具有较宽的调谐范围（235-390 nm）的紫外探测波长。利用400 nm皮秒脉冲泵浦光参量放大器，使其信号输出倍增，得到可调谐紫外探测器。棱镜单色器被用作可调谐锐截止带通滤波器，以减少由于UV探针的散射而产生的杂散光，使得可调谐范围内的任何波长都可以被选择作为UV探针的波长。用289和334 nm紫外探针测量了对巯基苯甲酸在金基底上的SFG光谱。SFG振动带强度由于羰基伸缩模式和苯环伸缩模式测量与289 nm的探针是约3倍大于那些测量与334 nm的探针。增强归因于电子共振效应。
We have constructed a multiplex infrared–ultraviolet (IR-UV) sum-frequency 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.