METHOD OF AVOIDING SPACE CHARGE SATURATION EFFECTS IN AN ION TRAP

摘要

A mass spectrometer is provided comprising a first ion trap (2) arrangedupstream of an analytical second ion trap(5). The charge capacity of the first ion trap (2) is set at a value such thatif all the ions stored within the first ion trap (2) up to thecharge capacity limit of the first ion trap (2) are then transferred to thesecond ion trap (5), then the analytical performance of thesecond ion trap (5) is not substantially degraded due to space charge effects.