高速有機化合物分子の表面電離質量スペクトル : アルキルアルコール

概要

論文の詳細を見る
Hyperthermal Surface Ionization Mass Spectrometry (HSIMS) has been performed on some alkyl alcohols with the ion source using rhenium oxide as an ion emitter and with a quadrupole mass spectrometer. Mass spectral results were obtained as a function of incident kinetic energy of organic molecules and system parameters, indicating that kinetic energy caused the surface ionization to increase drastically above threshold energy. The mass spectra were presented, interpreted in a purely empirical way and they were compared with conventional EIMS.In summary, a) alkyl alcohols are efficiently surface-ionized, b) abundant even electron ions (EE+) are observed generally in the HSIMS, c) in addition to these EE+ ions, strong radical cations such as (M-2·H)+· are observed, d) soft ionization can be obtained in general, where the quasi-molecular ion (M-·H)+ and quite a few fragments are generated, e) on the basis of these mass spectral findings, it is concluded that radical species are first generated by thermal dissociation, followed by the ionization of these species on the surface, f) characteristic mass spectral patterns for isomers were obtained, indicating that HSIMS can be usefully applied for the characterization of isomers.
日本質量分析学会の論文
1995-10-30