TANDEM QUADRUPOLE MASS SPECTROSCOPY DEVICE

摘要

A measurement condition memory (31) built in a controller (30) stores a CID gas condition table (31a) indicating a relation between the scan speed of a mass scan by a front-stage quadrupole mass filter (3) and a CID gas supply pressure. If the scan speed is high, an influence of a decrease in speed of ions due to collisions with a CID gas inside a collision cell (4) is relatively large. In view of this, such an appropriate CID gas supply pressure that reduces the decay of a peak waveform on a mass spectrum and makes the ion intensity as high as possible is examined in advance for each scan speed, and is stored in advance into the CID gas condition table (31a). During measurement of a target sample, if a precursor ion scan measurement mode or the like is designated, a CID gas supply pressure corresponding to the currently set scan speed is obtained based on the CID gas condition table (31a), and the CID gas supplier (8) is controlled. Accordingly, a mass spectrum with high peak separability and favorable sensitivity can be obtained regardless of the scan speed.