ION EXCITATION IN A LINEAR ION TRAP WITH A SUBSTANTIALLY QUADRUPOLE FIELD HAVING AN ADDED HEXAPOLE OR HIGHER ORDER FIELD

ION EXCITATION IN A LINEAR ION TRAP WITH A SUBSTANTIALLY QUADRUPOLE FIELD HAVING AN ADDED HEXAPOLE OR HIGHER ORDER FIELD

A two-dimensional substantially quadrupole field is established and maintained to trap a selected group of ions. The field has a quadrupole harmonic with amplitude A2, and a higher order harmonic with an amplitude AN, AN being greater than 0.1%. The selected group of ions are trapped in the field. A...

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Bibliographische Detailangaben
Hauptverfasser: MICHAUD, ANTHONY L, ZHAO, XIANZHEN, FRANK, AARON J, DOUGLAS, DONALD J
Format: Patent
Sprache:eng ; fre
Schlagworte:
BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
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Beschreibung
Zusammenfassung:A two-dimensional substantially quadrupole field is established and maintained to trap a selected group of ions. The field has a quadrupole harmonic with amplitude A2, and a higher order harmonic with an amplitude AN, AN being greater than 0.1%. The selected group of ions are trapped in the field. An oscillation frequency at a selected amplitude of excitation for the selected group of ions is determined. An excitation field at the selected amplitude of excitation is added to the two-dimensional substantially quadrupole field to deplete ions within a depletion peak having a low frequency side slightly above the oscillation frequency at the selected amplitude of excitation for the selected group of ions.