Abridged multipole structure for the transport, selection and trapping of ions in a vacuum system

Structure multipole simplifiee pour le transport, la selection et le piegeage d'ions dans un systeme a vide

Abstract

An improved trap-TOF mass spectrometer has a set of electrodes arranged to produce both a quadrupolar RF confining field and a substantially homogeneous dipole field. In operation, ions are first confined by the RF field and then, at a selected time, the RF confining field is discontinued and the dipole field is used to accelerate the ions so as to initiate a TOF MS analysis. The apparatus of the present invention may be used alone or in conjunction with other analyzers to produce mass spectra from analyte ions.

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