Ion source for quadrupole mass spectrometer

Details Ion source for quadrupole mass spectrometer Ion source for quadrupole mass spectrometer

1991-01-22

1992-10-06

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250427, 3133631, H01J 3708

Patent

active

051534320

ABSTRACT:
An ion source for a quadrupole mass spectrometer comprises, from the upstream end to the downstream end in the axis of the quadrupole, an ionization chamber with heated filament and electrostatic field associated with an electron-optical system provided with an electron convergence device. A uniform magnetic field is superimposed on the electrostatic field of the ionization chamber. The electron-optical system comprises a first extraction electrode having a downstream surface which is at least approximately spherical, a second coaxial electrode in the form of a disk having a central orifice of relatively substantial width and, at a short distance, a third electrode in the form of a disk having a relatively small central orifice, the potentials of the electrodes being so adjusted as to form hemispherical equipotential surfaces between the first and the second electrode.

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patent: 4891515 (1990-01-01), Jones et al.
"Catadioptric Electron Optics . . . " by R. Evrard, Advances in electronics and electron physics, 1978.

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