Program

Oral Sessions

Day 2, May 16（Wed.）　15:40-16:00　Room C (Seiun 2)

2C-O2-M-1540　　PDF

Development of a Secondary Neutrals Mass Spectrometer with a laser post-ionization for sub-micron scale in-situ isotopic analysis

(¹Osaka Univ., ²Osaka Univ. PRC, ³Osaka Univ., ⁴Hiroshima Univ.)
^oYosuke Kawai^1,2, Takahiro Matsuda¹, Kohei Miya¹, Toshinobu Hondo¹, Jun Aoki², Morio Ishihara^1,2, Michisato Toyoda², Ryosuke Nakamura³, Hikaru Yabuta⁴, Kentaro Terada^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.