Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Patent
1993-05-28
1995-03-21
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
250282, 250291, 250288, H01J 4942
Patent
active
053998570
ABSTRACT:
A method and apparatus for trapping ions in an ion trap having a ring electrode and a plurality of end-cap electrodes. Ions are introduced into a ion trap cavity of the ion trap from an external source or by desorption of a substance in the ion trap cavity. In a first embodiment, as the ions are introduced in the ion trap cavity, the amplitude of an RF voltage being applied to the ring electrode is gradually increased to trap the ions in the ion trap cavity. In a second embodiment, as the ions are introduced in the ion trap cavity, a retarding voltage is applied to the end-caps to reduce the initial kinetic energy of the ions. In a third embodiment, as the ions are introduced in the ion trap cavity from a probe tip inserted in the cavity, a retarding voltage is applied to the probe tip.
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Cotter Robert J.
Doroshenko Vladimir M.
Berman Jack I.
Beyer James
The Johns Hopkins University
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