1 0 0 0 OA ガス分析用大気圧ペニングイオン源の開発
- 著者
- 藤巻 奨 古屋 寛子 神原 静香 平岡 賢三
- 出版者
- 一般社団法人 日本質量分析学会
- 雑誌
- Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)
- 巻号頁・発行日
- vol.52, no.3, pp.149-153, 2004 (Released:2005-10-28)
- 参考文献数
- 13
- 被引用文献数
- 2 3
A direct gas introduction type atmospheric pressure Penning ionization source for on-site analysis of environmental organic pollutants was developed. The long-lived metastable argon atoms Ar* (3P2 and 3P0) were utilized for Penning ionization. As the excitation energies of Ar* are 11.5 eV (3P2) and 11.8 eV (3P0), the major components of air such as N2, O2, CO2, CO, and H2O are not ionized with Ar* but most of the organic compounds can be ionized. Atmospheric pressure Penning ionization mass spectra of all samples studied in our experiment showed abundant molecular-related ions (M+, [M+H]+, and [M-H]+) as base peaks. In the mass spectra of sample gases (M) mixed with methanol, intense ion [M+CH3]+ was observed in addition to [M+H]+ and [2M+H]+. The appearance of [M+CH3]+ is due to the occurrence of the methyl cation transfer reaction, CH3OH2++M→CH3+M+H2O.
1 0 0 0 OA エレクトロスプレー帯電液滴衝撃二次イオン質量分析法
- 著者
- 浅川 大樹 森 邦彦 平岡 賢三
- 出版者
- 日本質量分析学会
- 雑誌
- Journal of the Mass Spectrometry Society of Japan (ISSN:13408097)
- 巻号頁・発行日
- vol.55, no.3, pp.127-135, 2007 (Released:2007-06-15)
- 参考文献数
- 35
- 被引用文献数
- 4 4
A new ionization method, electrospray droplet impact ionization (EDI), has been developed for matrix-free secondary-ion mass spectrometry (SIMS). The charged droplets formed by electrospraying 1 M acetic acid aqueous solution are sampled through an orifice with a diameter of 400 μm into the first vacuum chamber, transported into a quadrupole ion guide, and accelerated at 10 kV after exiting the ion guide. The droplets impact on a dry solid sample (no matrix used) deposited on a stainless steel substrate. The secondary ions formed by the impact are transported to a second quadrupole ion guide and are mass-analyzed by an orthogonal time-of-flight mass spectrometer. EDI/SIMS was found to be an easy to operate and versatile method for molecular-level surface analysis.