A New Ionization Method for Organic Compounds.-Liquid Ionization at Atmospheric Pressure Utilizing Penning Effect and Chemical Ionization

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  • 有機化合物の新しいイオン化法―ペニング効果,化学イオン化を利用する大気圧・液体イオン化法
  • ユウキ カゴウブツ ノ アタラシイ イオンホウ ペニング コウカ カガク イオ

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We have developed a new ionization method for organic compounds in liquid phase at atmospheric pressure. The first process in this ionization reactions occured on the liquid surface is thought to be Penning ionization in which the excitation energy transfers from excited molecules of carrier gas to sample molecules, producing molecular ions. The subsequent reactions which may be the proton and/or hydrogen atom transfer between M+ and the surrounding molecules, involving charge transfer and chemical ionization reactions produce MH+ ions and several fragment ions. Characteristics of asimple ionization detector and a modified quadrupole mass spectrometer utilizing this method were described. Abundant M+ and MH+ ions were observed at near room temperature(∼ca. 40°C)for several less volatile compounds, such as dibutyl phthalate, chlorpheniramine, indomethacin etc., which give no or a small amount of molecular ions by EI and methane CI methods. Mass spectra of intermolecular cluster ions, such as(CH3COCH3)nH+(H2O)m(n=-1, m=1∼8;n=2, m=1∼4, shown in Figs.6 and 7)were also obtained.

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