A New UV Laser Oxygen Extraction System for In Situ 18O Measurement

用于原位 18O 测量的新型紫外激光氧气提取系统

• 批准号: 9204976
• 负责人: Bruno Giletti
• 金额: $ 7.2万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-01 至 1996-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9204976&HistoricalAwards=false
• 关键词: New; UV; Laser; Oxygen; Extraction

This award supports a feasibility study to test a new system for the quantitative release of oxygen from the surfaces of thick sections of silicate rocks or minerals by use of a pulsed excimer laser emitting in the ultraviolet (193 nm). The system will be designed to release molecules from the surface by breaking bonds without heating the sample significantly. The released molecules then are reacted with fluorine gas to liberate oxygen which is fed to a mass spectrometer in the form of CO2 gas. The system is expected to improve existing laser sources for stable isotope mass spectrometry which use longer wave length lasers that melt the sample before releasing oxygen-containing molecules, thereby causing spurious isotope fractionation and a degradation of the spatial resolution of the method.

该奖项支持一项可行性研究，以测试一种新系统，通过使用发射紫外线（193 nm）的脉冲准分子激光从硅酸盐岩石或矿物的厚部分表面定量释放氧气。该系统将被设计为通过破坏键从表面释放分子，而不显着加热样品。然后释放的分子与氟气反应释放氧气，氧气以二氧化碳气体的形式送入质谱仪。该系统有望改进用于稳定同位素质谱分析的现有激光源，该激光源使用更长波长的激光，在释放含氧分子之前熔化样品，从而导致虚假同位素分馏和该方法的空间分辨率下降。