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Development of Analytical Ion Microscope and Measurement of Isotopic Variations of Light Elements in Meteorites

分析离子显微镜的研制及陨石中轻元素同位素变化的测量

基本信息

批准号：
61420017
负责人：
NISHIMURA Hiroshi
金额：
$ 19.39万
依托单位：
Naruto University of Education
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (A)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1989
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61420017/
关键词：
Ion microscope SIMS Isotopic abundance of iron 同位体比異常マグネシウム同位体比変動

项目摘要

Mechanical set-up and arrangement of ION MICROSCOPE, which has been designed and developed for the last four years, have been completed. A high voltage power supply for the discharge of producing primary ions was also constructed. Furthermore, it was tested if main and scanning power supply for the electromagnet of mass spectrometer were clearly worked. As a result of the test mentioned above, these powers supplies were found to be effectively used for the magnetic scanning of the mass spectrometer. In addition to these, two pumping systems of turbo-molecular and oil rotary pumps were added to evacuate the ion ilicroscope chamber. 2 X 10^<-6> Pa was achieved by the pumping. Primary ion source was repaired so as to avoid the discharge between a ground potential part and a high voltage part. By this repair, unexpected discharge in the primary ion source chamber could be avoided and steady primary ions were produced. The detection current of the primary ions which was detected at the first drawing-out electrode to be about 40 muA. The construction of this ION MICROSCOPE was roughly completed.For the isotopic analysis of iron, laboratory standard of isotopic abundances of iron were determined with high accuracy. Hitachi IMA-2A ion microprobe analyzer of Osaka University was used for this analysis. The abundances were determined as listed in the following. ^<54>Fe= 5.7238<plus-minus>0.0015%, ^<56>Fe= 91.8545<plus-minus>0.0014%, ^<57>Fe= 2.1470<plus-minus>0.0005%, ^<58>Fe= 0.2746<plus-minus>0.0003%.

经过四年的设计和研制，离子显微镜的机械安装和布置已经完成。还研制了一种用于产生初级离子放电的高压电源。此外，还测试了质谱仪电磁铁的主电源和扫描电源是否正常工作。上述测试的结果是，这些电源被有效地用于质谱仪的磁扫描。除此之外，还增加了两个涡轮分子泵和油旋转泵的泵送系统，以疏散离子显微镜腔体。通过泵浦获得了2×10~(-6)pA的激光输出。对一次离子源进行了修复，避免了地电位部分和高压部分之间的放电。通过这种修复，避免了一次离子源室的意外放电，产生了稳定的一次离子。在第一个引出电极上检测到的初级离子的检测电流约为40MUA。该离子显微镜的建造已基本完成。为了进行铁的同位素分析，高精度地确定了铁的同位素丰度的实验室标准。采用日本大阪大学的日立IMA-2A型离子探针分析仪进行分析。丰度的测定如下所列。^&lt；54&gt；Fe=5.7238&lt；正负&gt；0.0015%，^&lt；56&gt；Fe=91.8545；正负&gt；0.0014%，^&lt；57&gt；Fe=2.1470&lt；正负&gt；0.0005%，^&lt；58&gt；Fe=0.2746&lt；正负&gt；0.0003%。