ION POPULATION CONTROL DEVICE FOR A MASS SPECTROMETER

摘要

A mass spectrometer is disclosed wherein an ion beam attenuator (23) is arranged upstream of an ion trap mass analyser (20). An ion tunnel ion trap comprising an upstream ion accumulation section (21) and a downstream ion accumulation section (22) is arranged upstream of the ion beam attenuator (23). Ions are released from the ion tunnel ion trap and the intensity of the ion beam which is transmitted to the ion trap mass analyser (20) is controlled by the ion beam attenuator (23). The fill time during which ions are admitted into the ion trap mass analyser (20) remains substantially constant and is substantially independent of the intensity of the ion beam.