ポスター発表
- 第3日 5月17日（金） P会場（多目的ホール）
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3P-03 PDF
イオンカウンティングと波形積算を組み合わせた高ダイナミックレンジイオン検出手法の開発
The most common data acquisition method in a time-of-flight (TOF) mass spectrometry is an "averaging mode" that sums ion current signals obtained from a detector for each flight cycle. While it is possible to process many ions arrived at the detector at the same TOF in one flight cycle, low abundance ions are difficult to measure because the spectral quality easily affected by noise signals from the detection system. An “ion-counting mode” is suitable for the measurement of such low concentration ions, but counting loss occurs when two or more ions arrive at the detector within the dead time of the acquisition system. To compensate for these disadvantages, we have developed a new data acquisition method that combines two modes to measure target ions with a high concentration difference, i.e., averaging mode and ion-counting mode are used simultaneously for high abundant and trace ions, respectively. The result of the argon isotope analysis shows that this method provides a more accurate determination of the isotope ratio compared to averaging mode alone at one-twentieth of the analysis time required by ion-counting mode alone.