Overcoming space charge effects in ion cyclotron resonance...

Details Overcoming space charge effects in ion cyclotron resonance... Overcoming space charge effects in ion cyclotron resonance...

2007-12-17

2009-11-10

Wells, Nikita (Department: 2881)

Radiant energy

Ionic separation or analysis

Methods

C250S281000, C250S283000, C250S291000, C250S292000, C250S293000, C250S307000

Reexamination Certificate

active

07615743

ABSTRACT:
In an ion cyclotron resonance mass spectrometer in which ions are trapped axially by applying electrical potentials to a pattern of electrode elements to produce an inhomogeneous alternating radio-frequency electric field with a repulsive effect, an additional electrostatic ion-attracting field is superimposed on the repulsive electric field. The voltage of the ion-attracting field is adjusted to compensate for a cyclotron frequency shift of the ions caused by the ion space charge. The voltage of the ion-attracting field can be adjusted so that the ion cyclotron frequency of all ions becomes independent of the number of ions inside the spectrometer.

REFERENCES:
patent: 5019706 (1991-05-01), Allemann et al.
patent: 7038200 (2006-05-01), Nikolaev
patent: 7368711 (2008-05-01), Franzen et al.
patent: 7495211 (2009-02-01), Franzen et al.
patent: 2006/0027743 (2006-02-01), Franzen et al.
patent: 2006/0226357 (2006-10-01), Franzen et al.

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