Analytical Sciences

Abstract − Analytical Sciences, 18(5), 567 (2002).

Use of Ring-Repeller, Double-Skimmer Electrodes for Efficient Ion Focusing in Mass Spectrometry
Junichi MATSUMOTO, Genta SAITO, and Totaro IMASAKA 
Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, Hakozaki, Higashi, Fukuoka 812-8581, Japan
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.