飛行時間型質量分析計のイオン源として用いるイオントラップの開発

概要

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We have constructed a new apparatus which is suitable for investigating ion-molecular reactions, by combining a laboratory-made cylindrical ion trap with a time-of-flight (TOF) mass spectrometer. The cylindrical ion trap electrodes were not a mass analyzer but a reaction cell and an ion source of a mass spectrometer. The TOF mass spectrometer, developed at Osaka University, has four electric sector electrodes and can give enough mass resolution to determine reaction products with high accuracy. Several electric circuits, RF power amplifier and high voltage switch circuit, designed for ion storage and ejection are also described. As tests we have measured TOF spectra of xenon ions and iodine ions. We have observed ion-molecular reactions of iodine ions in iodine vapor. Ions created by electron ionization were stored in the ion trap up to a few seconds. While they were stored, they react with background gas. After certain storage periods, ions were ejected into the analyzing part by pulse voltage and then mass resolved. Acquired mass resolutions (m/ Δm) were about 650 and 500 for xenon and iodine, respectively. The data for iodine indicated that trimer ions I3+ comparable in amount to I2+ were produced through the reaction of I2+ ions with neutral I2 molecules.
日本質量分析学会の論文
2002-10-01