演題概要

ポスター発表

第2日　5月18日（木）　　P会場（多目的ホール）

2P-49　　PDF

サブミクロンスケール局所同位体分析に向けたレーザーポストイオン化SNMSの開発

(¹阪大院理・ ²阪大院理/PRC・ ³阪大産学連携・ ⁴広島大院理)
^o河井洋輔^1,2・ 松田貴博¹・ 宮晃平¹・ 本堂敏信¹・ 青木順^1,2・ 石原盛男^1,2・ 豊田岐聡^1,2・ 中村亮介³・ 薮田ひかる⁴・ 寺田健太郎^1,2

Isotopic compositions of various meteorites provide us an important clue to decipher the origin and evolution of the solar system. To accomplish a sub-micron scale resolution analysis (< 1 μm), we have been developing a Secondary Neutrals Mass Spectrometer (SNMS) with a high-power femto-second laser which post-ionizes neutrals sputtered by a focused ion beam. From the measurement of terrestrial zircons containing 100 ppm uranium toward the application to in-situ U-Pb chronology, U and oxidized U ions could be detected with a sputtered area of 1 μm in diameter. The high spatial resolution enabled to determine isotopic ratios of both major and trace elements in single SiC presolar grains.