New High Efficiency Deep UV Raman Spectrometer for Standoff Detection

S. Bykov, S. Asher
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引用次数: 0

Abstract

UV resonance Raman spectroscopy is uniquely suitable for standoff measurements due to its high sensitivity and selectivity. When excitation wavelength falls within an electronic transition of a molecule, Raman band intensities associated with the chromophore vibrations are significantly enhanced. This resonance Raman Effect, as well as negligible fluorescence interference in the deep UV, enable the detection and investigation of enhanced species at trace concentrations at a distance. We developed a state-of-the-art, high-efficiency standoff deep UV Raman spectrometer. This spectrometer is based on a custom deep UV F/8 Cassegrain telescope with a 200 mm primary mirror. This telescope is equipped with an electric secondary focus operating from infinity to 3 m distance. The UV Raman spectrograph utilizes high-efficiency deep UV transmission grating and custom Rayleigh rejection filter. As an excitation source for Raman measurements, we utilized a recently developed 228 nm compact solid state deep UV laser. The 228 nm resonance excitation enhances the Raman intensities of vibrations of NOx groups, peptide bonds, aromatic amino acid side chains, and DNA/RNA nucleotides. We used this novel spectrometer for detection of NOx-based explosive materials at trace concentrations at a stand-off distance.
新型高效深紫外拉曼光谱仪
紫外共振拉曼光谱由于其高灵敏度和选择性而特别适合于对峙测量。当激发波长落在分子的电子跃迁范围内时,与发色团振动相关的拉曼带强度显着增强。这种共振拉曼效应,以及在深紫外中可忽略不计的荧光干扰,使在远处的微量浓度下检测和研究增强的物种成为可能。我们开发了一种最先进的,高效的对峙深紫外拉曼光谱仪。该光谱仪是基于一个定制的深紫外F/8卡塞格伦望远镜与一个200毫米的主镜。这个望远镜配备了一个电二次聚焦,工作距离从无限远到3米。紫外拉曼光谱仪采用高效深紫外透射光栅和定制瑞利抑制滤波器。作为拉曼测量的激发源,我们使用了最近开发的228 nm紧凑固体深紫外激光器。228 nm共振激发增强了NOx基团、肽键、芳香氨基酸侧链和DNA/RNA核苷酸的拉曼振动强度。我们使用这种新型光谱仪在远距离检测微量浓度的nox基爆炸性物质。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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