FOURIER-TRANSFORM MASS SPECTROMETER.

摘要

A Fourier-transform mass spectrometer suitable for analysis of a specific component in sample gas whose components are known, for preventing the deviation of a high-frequency electric field applied to a high-vacuum cell due to a long-period fluctuation of a static magnetic field applied to the high-vacuum cell. The long-period fluctuation of the applied magnetic field is detected as the change in ion-cyclotron resonance frequency of the specific component to vary the frequency of the high-frequency electric field in accordance with the change of the ion-cyclotron resonance frequency.