| 摘要 |
A mass spectrometer is disclosed comprising a vortex mass filter/analyser. The vortex mass filter/analyser preferably comprises a chamber with a central rotatable shaft connected to a pressure reducing means. As the shaft rotates, a vortex is created within the chamber. The centrifugal force on an ion in the vortex is arranged to be balanced at a certain radius of rotation within the chamber by the electric force due to an opposed radial electric field. Ions having a certain mass to charge ratio are arranged to be maintained at a stable equilibrium at this radius and can then be selectively removed for further analysis. With this arrangement, no magnetic field is required and the apparatus can operate at pressures around that of atmospheric pressure.
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