Shielded lens

Details Shielded lens Shielded lens

1997-09-10

1999-08-24

Westin, Edward P.

Radiant energy

With charged particle beam deflection or focussing

Magnetic lens

250287, 250281, G21K 108, G21K 1087, B01D 5944

Patent

active

059427582

ABSTRACT:
The present invention relates generally to ion beam handling in mass spectrometers, and more specifically to a method and apparatus for focusing ions in time-of-flight mass spectrometers (TOFMS). This invention focuses ions using one or more electrodes bound on at least one side by an electrically conducting grid. Electric fields generated by the electrodes focus the ions. With electric fields of the proper strength and geometry, ions may be focused onto a point some desired distance from the source. According to the preferred embodiment of the present invention, a shielded lens, in the form of an electrically conducting cylinder and two conducting grids, is used to produce and adjust the position of an ion focal point.

REFERENCES:
patent: 5144127 (1992-09-01), Williams et al.
patent: 5464985 (1995-11-01), Cornish et al.
patent: 5614711 (1997-03-01), Li et al.

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