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Upgrading of the Vibrational Spectroscopy Laboratory at Virginia Tech

弗吉尼亚理工大学振动光谱实验室升级

基本信息

批准号：
0322119
负责人：
Robert Bodnar
金额：
$ 29.6万
依托单位：
Virginia Polytechnic Institute and State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2004
资助国家：
美国
起止时间：
2004-02-15 至 2006-01-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0322119&HistoricalAwards=false
关键词：
Upgrading Vibrational Spectroscopy Laboratory Virginia

项目摘要

EAR-0322119BodnarDuring the past decade significant advances have been made in instrumentation for measuring the vibrational spectra of solids, liquids and gases. Modern Raman microprobes use a wavelength-specific polymer notch filter to remove incident radiation and stray light. Earlier designs accomplished this through use of a series of mirrors and lenses that focused the Raman signal onto the detector, with considerable loss of energy along the beam path. As a result, modern Raman instruments have much higher energy throughput and concomitantly, significantly lower detection limits for all covalently bonded species. This project will upgrade the capabilities of the Vibrational Spectroscopy Laboratory at Virginia Tech by acquiring a Raman microprobe that employs a visible wavelength laser (514 nm), as well as a state of the art system that uses an ultraviolet laser (325 nm) as the excitation source. Unlike the visible system, this latter system is not affected by fluorescence from the sample, permitting analysis of organic compounds and other phases that fluoresce when illuminated. The instruments will be applied in a variety of new and ongoing projects, including development of techniques for determining water contents of silicate melt inclusions, quantitative analysis of carbon dioxide and methane-bearing fluid inclusions, analysis of petroleum fluid inclusions and in situ characterization of corrosion products in natural and anthropogenic environments.

在过去的十年中，用于测量固体、液体和气体振动谱的仪器取得了重大进展。现代拉曼微探针使用波长特定的聚合物陷波滤波器来去除入射辐射和杂散光。早期的设计通过使用一系列反射镜和透镜将拉曼信号聚焦到探测器上来实现这一点，在光束路径上有相当大的能量损失。因此，现代拉曼仪器具有更高的能量通量，同时对所有共价键合物质的检测限显着降低。该项目将升级弗吉尼亚理工大学振动光谱学实验室的能力，通过获得使用可见波长激光（514纳米）的拉曼微探针，以及使用紫外线激光（325纳米）作为激发源的最先进系统。与可见系统不同，后一种系统不受样品荧光的影响，允许分析有机化合物和其他在照射时发出荧光的相。这些仪器将用于各种新的和正在进行的项目，包括开发测定硅酸盐熔体包裹体含水量的技术，对二氧化碳和含甲烷流体包裹体进行定量分析，对石油流体包裹体进行分析，以及在自然和人为环境中对腐蚀产物进行现场表征。