プログラム

オーラルセッション

第2日　5月16日（水）　15:40～16:00　C会場（星雲2）

2C-O2-M-1540　　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²・ 石原盛男^1,2・ 豊田岐聡²・ 中村亮介³・ 薮田ひかる⁴・ 寺田健太郎^1,2

Isotopic compositions in extraterrestrial materials provide us an important clue to decipher the origin and evolution of the solar system. To accomplish a sub-micron scale spatial resolution analysis, we have been developing a Secondary Neutrals Mass Spectrometer (SNMS) with a femtosecond laser, which post-ionizes neutrals sputtered by a focused ion beam. For the application to in-situ U-Pb chronology, terrestrial zircons were measured and it was confirmed that 100 ppm uranium could be detected from an area of 1 μm in diameter. The high spatial resolution allows the isotopic analysis of both major and trace elements in single presolar grains which provide information about stellar nucleosynthesis and galactic chemical evolution.