Mass spectrometer and method

Details Mass spectrometer and method Mass spectrometer and method

1984-05-15

1986-04-08

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Methods

250291, H01J 4900, B01D 5944

Patent

active

045815330

ABSTRACT:
A mass spectrometer including a vacuum chamber wherein molecular flow conditions are maintained. A sample introduced into the chamber is ionized while a magnetic field through the chamber induces ion cyclotron resonance. Trapping plates are provided for restricting ion movement along the magnetic field while a conductance limit plate divides the chamber into first and second compartments. The conductance limit plate has an orifice configured to allow ion equilibration between the compartments while maintaining a pressure differential between them. The conductance limit plate includes an electrode that is selectively connected to a means for applying trapping potential to selectively trap ions in one of said compartments.

REFERENCES:
patent: 2633539 (1953-03-01), Altar
patent: 3390265 (1968-06-01), Llewellyn
patent: 3937955 (1976-02-01), Comisarow et al.

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