Use of Ring-Repeller, Double-Skimmer Electrodes for Efficient Ion Focusing in Mass Spectrometry

Abstract

The design and construction of a new type of time-of-flight mass spectrometer is described. The instrument was designed to improve the ionization efficiency and to efficiently detect ions. The system performance was evaluated using the SIMION software, and was compared with the experimental results. The shapes of the repeller, extraction, and ground electrodes had a strong effect on the trajectory of ions in the processes of ion acceleration and focusing. The major difference between the theory and the experiment can be attributed to space-charge effects.

Analysis of Persistent Organic Pollutants at Sub-Femtogram Levels Using a High-Power Picosecond Laser for Multiphoton Ionization in Conjunction with Gas Chromatography/Time-of-Flight Mass Spectrometry

“…The TOF-MS instrument developed in our laboratory has been described in detail elsewhere, [30][31][32][33] and is now commercially available (HGK-1, Hikari-GK, Fukuoka, Japan). One microliter of sample solution was injected into a GC (6890GC, Agilent Technologies) using an auto sampler (6890N, Agilent Technologies).…”

Signal Enhancement by Crossing the Sample Flow at a Small Angle against the Laser Beam in Multiphoton Ionization Mass Spectrometry

“…The TOF-MS instrument used in this study was developed in our laboratory, [13][14][15] and is now commercially available (HGK-1, Hikari-GK, Fukuoka, Japan). For comparison of the techniques shown in Figs.…”

Development of a Compact Supersonic Jet/Multiphoton Ionization/Time-of-Flight Mass Spectrometer for the On-site Analysis of Dioxin, Part I: Evaluation of Basic Performance

“…This value is slightly superior to that obtained in previous experiments. 12 The diameters of the skimmers for the extraction and ground electrodes were expanded from 10 mm to 30 mm, and, as a result, the ions are not tightly focused and travel nearly in parallel in the flight tube. This is favorable for improving the mass resolution, since the difference in the distance that the ion travels to the detector can be minimal.…”

“…An assembly of electrodes for ion acceleration and focusing was designed for better ion transmission. 12 The configuration of the ion acceleration electrodes and the potentials applied to these electrodes were optimized. Figure 1 shows an experimental apparatus developed for use in this study.…”

“…A detailed description of the ring-repeller, double-skimmer electrode assembly for efficient ion focusing has been reported elsewhere. 12 The ions are efficiently collected by the extraction electrode, and ion defocusing is then reduced using an einzel lens. The ion trajectory was calculated using SIMION software, so as to be focused tightly.…”