抄録
This paper reports a microcomputer based data acquisition system for Fourier transform ion cyclotron resonance (FT-ICR) mass spectroscopy. The system has been developed for a prototype spectrometer constructed with a permanent magnet whose magnetic field strength is 6,200 gauss. The system cosists of two-channel sampling ports with sample-hold circuits, a multiplexer, an A-D converter, an I/O port and a logic circuit. The logic circuit starts data acquisition synchronizing with an external trigger pulse. The acquisition is then repeated for preset number of times to accumulate data for signal averaging. An operating program for the system was written in an assembly language in order to execute high-speed data acquisition and a program for FT-ICR experiments was written using BASIC. Resolution of 40,000 was obtained with CO+ ion in residual gas.
