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Development of Technique for measuring light elements by SIMS

SIMS测量轻元素技术的开发

基本信息

批准号：
08454162
负责人：
SUGIURA Naoji
金额：
$ 2.05万
依托单位：
Univ.of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08454162/
关键词：
light elements Botope secondary ion mass spectrometry nitrogen carbon hydrogen 窒素同位体比感度鉄隕石

项目摘要

The purpose of this project was to establish techniques for measuring light element abundances and isotopic ratios by SIMS.1) Nitrogen measurements.The method for measuring nitrogen abundances and isotopic ratios in metallic samples was established. As the nitrogen measurement is strongly affected by contamination, the detection limit is about 100 ppm. Isotopic composition of nitrogen can be measured with a precision of several permil at a nitrogen concentration of several hundreds of ppm.2) Carbon measurements.The method for measuring carbon abundances and isotopic ratios was established. The detection limit is several tens of ppm. At this concentration, the isotopic ratios can be determined with a precision of several permil. Such a measurement takes about 10 minutes.3) Hydrogen measurements.The detection limit of hydrogen has not been established yet. But at a concentration of 0.5 wt.% (e.g. biotite) the hydrogen signal is large enough of both abundance and isotopic measurements. At the moment.the precision of isotopic measurements is about 5%, which seems to be mainly due to not-well-controlled instrumental mass fractionation.

本项目的目的是建立利用二次离子质谱仪测量轻元素丰度和同位素比值的技术。1）氮测量：建立了金属样品中氮丰度和同位素比值的测量方法。由于氮测量受污染物的强烈影响，检测限约为100 ppm。在氮浓度为几百ppm的条件下，氮同位素组成的测量精度可达千分之几。2）碳的测量建立了碳丰度和同位素比值的测量方法。检测限为几十ppm。在这个浓度下，同位素比率可以以几个千分之一的精度确定。这样的测量大约需要10分钟。3）氢的测量。氢的检测限尚未确定。但在0.5重量%的浓度下，(e.g.黑云母），氢信号对于丰度和同位素测量都足够大。目前，同位素测量的精度约为5%，这似乎主要是由于仪器质量分馏控制不好。