Refurbishment of a VG Sector Mass Spectrometer to Gain Negative Ion Capability

翻新 VG 扇形质谱仪以获得负离子功能

• 批准号: 0345135
• 负责人: Samuel Mukasa
• 金额: --
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 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: 2004-07-01 至 2006-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0345135&HistoricalAwards=false
• 关键词: Refurbishment; VG; Sector; Mass; Spectrometer

EAR-0345135MukasaFunds from this award are to be used to convert an old VG Sector conventional thermal ionization mass spectrometer at the University of Michigan into a negative ion thermal ionization mass spectrometer (N-TIMS). Once modified, the instrument will be used in geological and environmental studies that require the measurement of isotopic ratios for osmium and boron in their electronegative form. We anticipate collaborations with both internal and external colleagues, which will keep the facility very busy. The mass spectrometer to be converted has the "Multi-1" collector block with six old-design, short-life, Faraday cups that are moved manually. Because of their advanced age and throughput, the Faraday detectors have suffered some damage leading to degradation in gain and peak shape. The net result of this wear and tear is poor precision and reproducibility in the measurements of Sr and Nd isotopic ratios. However, because osmium and boron isotopic ratios have very large variations in nature, their measurements do not require the high precision necessary for Sr and Nd isotopes. Therefore, refurbishing the electronic components of the instrument along with converting it to negative ion capability - but not replacing the collectors - will extend the machine's life and afford us the opportunity to do research in new areas of the geological and environmental sciences. This N-TIMS conversion will open our respective groups to new areas of research that use electronegative ions, such as Os and B, and provide our students and postdoctoral research fellows with a "new tool" for tackling their research projects in high-temperature geochemistry, petrology, environmental geochemistry economic geology, and paleooceanography. Just as importantly, the refurbished instrument will be used to teach students some fundamental skills such as mass spectrometry, formulation of research problems, objective data processing and analysis, and the presentation of written and oral reports. These skills can be applied to later work situations in academia, government, or industry.

Mukasa-0345135 Mukasa该奖项的资金将用于将密歇根大学的旧VG部门常规热电离质谱仪转换为负离子热电离质谱仪（N-TIMS）。该仪器经改装后，将用于需要测量锇和硼的电负性同位素比率的地质和环境研究。我们期待与内部和外部同事的合作，这将使设施非常忙碌。待转换的质谱仪具有“多1”收集器块，该收集器块具有六个手动移动的旧设计、短寿命、法拉第杯。由于其老化和吞吐量，法拉第检测器遭受了一些损坏，导致增益和峰形的退化。这种磨损的最终结果是Sr和Nd同位素比测量的精确度和重现性较差。然而，由于锇和硼同位素比值在自然界中具有非常大的变化，因此它们的测量不需要Sr和Nd同位素所必需的高精度。因此，沿着翻新仪器的电子元件，并将其转换为负离子能力-但不更换收集器-将延长机器的寿命，并为我们提供在地质和环境科学的新领域进行研究的机会。这一N-TIMS转换将为我们各自的研究小组开辟新的研究领域，使用电负性离子，如Os和B，并为我们的学生和博士后研究人员提供一个“新工具”，用于解决他们在高温地球化学，岩石学，环境地球化学，经济地质学和古海洋学的研究项目。同样重要的是，翻新后的仪器将用于教授学生一些基本技能，如质谱法，研究问题的制定，客观的数据处理和分析，以及书面和口头报告的介绍。这些技能可以应用于学术界，政府或行业的后期工作环境。