Mass spectrometer

摘要

A mass spectrometer is disclosed comprising a time of flight mass analyser. The time of flight mass analyser comprises an ion guide comprising a plurality of electrodes which are interconnected by a series of resistors forming a potential divider. Ions are confined radially within the ion guide by the application of a two-phase RF voltage to the electrodes. A single phase additional RF voltage is applied across the potential divider so that an inhomogeneous pseudo-potential force is maintained along the length of the ion guide.

主权项

1. A mass spectrometer comprising:
a collision gas cell comprising an ion guide, wherein said ion guide comprises a plurality of electrodes; and one or more voltage supplies arranged and adapted to confine ions radially within said ion guide; wherein an axial pseudo-potential ramp is formed, created or maintained along at least a portion of the axial length of said ion guide to propel, force or urge ions along the length of the ion guide.