Mass spectrometer with beam expander

摘要

A mass spectrometer is disclosed comprising a RF confinement device, a beam expander and a Time of Flight mass analyzer. The beam expander is arranged to expand an ion beam emerging from the RF confinement device so that the ion beam is expanded to a diameter of at least 3 mm in the orthogonal acceleration extraction region of the Time of Flight mass analyzer.

主权项

1. A mass spectrometer comprising:
a first Time of Flight mass analyzer arranged and adapted to analyze positiveions;
a second Time of Flight mass analyzer arranged and adapted to analyze negative ions, wherein said second Time of Flight mass analyzer is arranged adjacent to said first Time of Flight mass analyzer; and a pusher electrode common to said first and second Time of Flight mass analyzers, wherein said first Time of Flight mass analyzer further comprises a first grid electrode and said second Time of Flight mass analyzer further comprises a first grid electrode; wherein, in use, ions are arranged to arrive in an orthogonal acceleration extraction region arranged between said pusher electrode and said first grid electrodes and wherein ions are directed into either said first Time of Flight mass analyser or said second Time of Flight mass analyser by choosing a polarity of a voltage pulse applied to said pusher electrode.