U.S.-France Cooperative Research: Development of Multiple- Collector SIMS Techniques for High Precision Isotopic Analyses

这一为期两年的奖项为美法合作研究提供支持，该研究旨在开发使用Cameca IMS 1270离子微探针测量地质样品中同位素丰度的新技术，Cameca IMS 1270离子微探头是新一代高灵敏度-高分辨率二次离子质谱仪(SIMS)。加州大学洛杉矶分校的凯文·麦基根和法国南希地球化学研究和岩石学中心的马克·乔西登的研究小组参与了这项合作。第一个IMS 1270作为国家科学基金会的国家设施在加州大学洛杉矶分校运行。美国和法国的仪器配备了独特的多离子束收集器组件。这种多收集器应该可以提高使用SIMS进行同位素分析的精密度和准确度。美国调查人员为这次合作带来了使用新的IMS 1270测量氧和碳同位素的专业知识和经验。这一点得到了法国在多收集器SIMs上的经验的补充。这些小组将通过交叉校准每个实验室的样品并分享分析技术、软件开发和硬件改进来进行合作。该项目将推进对陆地和地外样品的同位素测量的使用，并开辟同位素地球化学的新研究领域。

This two-year award provides support for US-France cooperative research aimed at developing new techniques for measuring isotopic abundance in geologic samples using the CAMECA ims 1270 ion microprobe, a new generation high sensitivity - high resolution secondary ion mass spectrometer (SIMS). The collaboration involves the research groups of Kevin McKeegan at the University of California, Los Angeles and Marc Chaussidon at the Center for Geochemical Research and Petrography in Nancy, France. The first ims 1270 is operating at UCLA as a National Science Foundation national facility. The US and French instruments are equipped with a unique multiple ion beam collector assembly. This multiple collector should allow improvements in precision and accuracy of isotopic analyses using SIMS. The US investigators bring to this collaboration expertise and experience in measuring oxygen and carbon isotopes with the new ims 1270. This is complemented by French experience with the multicollector SIMS. The groups will collaborate by cross- calibrating samples in each laboratory and sharing analytical techniques, software developments, and hardware improvements. The project will advance the use of isotope measurements of terrestrial and extraterrestrial samples and open new research areas in isotope geochemistry.