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1. (WO2001029876) DOUBLE-FOCUSING MASS SPECTROMETER APPARATUS AND METHODS REGARDING SAME

Pub. No.:    WO/2001/029876    International Application No.:    PCT/US2000/041261
Publication Date: Apr 26, 2001 International Filing Date: Oct 18, 2000
IPC: H01J 49/32
Applicants: REGENTS OF THE UNIVERSITY OF MINNESOTA
Inventors: GENTRY, W., Ronald
GIESE, Clayton, F.
DIAZ-DIAZ, Jorge, A.
Title: DOUBLE-FOCUSING MASS SPECTROMETER APPARATUS AND METHODS REGARDING SAME
Abstract:
A double-focusing mass spectrometer apparatus includes a first cylindrical sector electrode defined at a first radial distance from an axis with the first cylindrical sector electrode having an upper and lower edge and a second cylindrical sector electrode surface defined at a second radial distance from the axis with the second cylindrical sector electrode having an upper and lower edge corresponding to the upper and lower edge of the first cylindrical sector electrode. An ion path is defined between the first and second cylindrical sector electrodes. A first magnet pole and a second magnet pole are positioned proximate the upper and lower edges of the first and second cylindrical sector electrodes, respectively, for providing a magnetic field in the ion path. A first and second array of electrodes, e.g., cylindrical segment electrodes, are positioned between the upper edges and lower edges of the first and second cylindrical sector electrodes, respectively, for use with the first and second cylindrical sector electrodes to provide a desired electric field in the ion path perpendicular to the magnetic field.