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Poster Presentations
Day 3, June 24（Tue.）
Room P (Maesato East, Foyer, Ocean Wing)
- 3P-PM-37
Evaluation of Accuracy and Precision on the Multi-Turn Time-of-Flight Secondary Neutral Mass Spectrometry (MULTUM-SNMS) and Its Application to Extraterrestrial Materials
(Univ. of Osaka)
oShigeru Ujita, Hiromu Shinozaki, Kohei Fukuda, Toshinobu Hondo, Yosuke Kawai, So Jinnouchi, Michisato Toyoda, Kentaro Terada
The matrix, fine-grained particles from 10 nm to 5 μm in size, is a major component of primitive meteorites. Although the matrix is a key to reveal the planet formation in the Solar system, its origin and formation process are unresolved due to its analytical difficulty. Individual matrix particles are so small (< μm) that determining the trace element concentrations of matrix particles by conventional methods such as SIMS is challenging. Secondary neutral mass spectrometry (SNMS) is expected to overcome this difficulty owing to “post ionization".
Here, we evaluated the accuracy and precision of high-spatial resolution (< 800 nm) multi-turn time-of-flight (MULTUM)-SNMS by determining the abundances of Mg, Mn, and Fe relative to Si for an olivine reference material (RM). The evaluated variability and deviation from true values of the RM analysis were both within 3% (2σ), demonstrating its capability to distinguish elemental fractionation at the percent level. The evaluated method was applied to matrix olivine grains from NWA 14499 (CR2) carbonaceous chondrite. Among the 15 matrix particles analyzed, two olivines were identified as LIME olivines, indicative of gas-solid condensation. Overall, our results demonstrate that the major elemental abundances of matrix particles were quantitatively analyzed at the submicron scale.