抄録
Because the resolution of Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometers is inversely proportional to the mass of ion, they are particularly suited to the analysis of low mass samples. For this purpose the magnetic field generated by permanent magnets is adequate. The spectrometer using a permanent magnet has the advantages of low cost, compact size and easy operation and maintenance. These features have motivated us to develope a new FT-ICR spectrometer with a permanent magnet which can determine chemical composition of samples by precise mass measurement. The magnet is made of rare-earth compound and the magnetic circuit is designed to be compact and to generate a highly homogeneous magnetic field. The spectrometer can be easily operated with a track-ball and a ten-key board. Mass resolution of 104-105 is obtained in the normal operating conditions. It is shown that the spectrometer can analyse the composition of gases having the same mass numbers such as CO/N2/C2H4, CO2/N2O and He/D2. The spectrometer will be useful for industrial applications like process and medical analyses.
