[14p-B6-1~12] 7.5 イオンビーム一般

[14p-B6-8] タングステン針を用いたグリシンのアトムプローブ分析

〇羽路 祐紀¹、入場 紀明¹、西村 知紗¹、曽根 輔¹、辻 博司¹、後藤 康仁¹ (1.京大院工)

キーワード：アトムプローブ分析、飛行時間形質量分析、グリシン

We have previously shown a newly developed time-of-flight mass spectrometer with a capability of identification of lighter atom ions. In this study, time-of-flight measurement with the spectrometer was performed in ion beam extracted from glycine. The simplest structural amino acid, glycine, was formed on a sharp tungsten tip by vacuum deposition. The obtained mass spectra exhibit the dependence of produced ion species depending on field strength. In a condition of limited evaporation yields by dc voltage application to the specimen, singly charged monomer were measured. Given higher tip voltage, doubly charged monomer and a specific fragment pair upon C-C bond dissociation were predominantly detected. Our results suggest that tip voltage level control determines the produced ion species during atom probe analysis, preventing overlaps in mass spectrum and providing possibility of further accurate identification of ions.