Positive and negative ion recording system for mass...

Details Positive and negative ion recording system for mass... Positive and negative ion recording system for mass...

G - Physics

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358/9

G01N 23/207 (2006.01) H01J 49/02 (2006.01) H01J 49/14 (2006.01) H01J 49/42 (2006.01)

Patent

CA 1076714

TITLE OF THE INVENTION: POSITIVE AND NEGATIVE ION RECORDING SYSTEM FOR MASS SPECTROMETER ABSTRACT OF THE DISCLOSURE A method and an apparatus are disclosed for adapting a conventional quadrupole mass spectrometer to substantially simultaneously produce and record both positive and negative ions. The apparatus includes a control circuit for rapidly switching the repeller, source and lens electrodes of a quadrupole mass spectrometer between positive and negative potentials. This switching of the potentials, along with the selection of appropriately favorable ionization conditions, permits the generation of suitable streams of positive and negative ions. A dual electron multiplier detector is used for separately sensing the positive and negative ions transmitted through the quadrupole mass spectrometer. The disclosed method and apparatus are particularly suitable for obtaining accurate mass measurements using a quadrupole mass spectrometer.

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