Abstract
Methods are described for greatly improving the mass resolution of an ion cyclotron resonance mass spectrometer. The factors affecting mass resolution are examined in detail, and the conditions for maximum resolution are discussed. Only three parameters — magnetic field strength, cyclotron frequency, and analyzer cell trapping voltage — are needed to make accurate, absolute mass measurements. Ions are detected with a solid-state marginal oscillator circuit which has been designed to be stable at very low r.f. levels.
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