Tapered or tilted electrodes to allow the superposition of indep

Details Tapered or tilted electrodes to allow the superposition of indep Tapered or tilted electrodes to allow the superposition of indep

1997-03-12

2000-12-19

Nguyen, Kiet T.

Radiant energy

With charged particle beam deflection or focussing

Magnetic lens

250292, H01J 4900

Patent

active

061630322

ABSTRACT:
The present invention is embodied in a method and apparatus for transporting ions via a path generated by RF electrodes having a controllable DC field gradient generated thereon which does not suffer from mass discrimination. In a preferred embodiment, the number of electrodes are doubled to thereby use symmetry to cancel an undesirable DC quadrapole field. By eliminating the DC quadrapole field, the passband of the DC field gradient is increased, allowing for ions of higher mass to be transported. The electrodes are either tilted or tapered to thereby generate the desirable DC field gradient. Tilting and/or tapering the electrodes advantageously modifies the DC field gradient to increase the high ion mass cut-off.

REFERENCES:
patent: 5847386 (1998-12-01), Thomson et al.

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