Quadrupole ion trap mass spectrometer having two pulsed axial excitation input frequencies and method of parent and neutral loss scanning and selected reaction monitoring

摘要

This invention relates generally to a quadrupole ion trap mass spectrometer and method of operation and more particularly to an ion trap mass spectrometer in which pulses of energy of predetermined frequencies are applied across the end caps to independently and sequentially excite ions of different masses trapped in the ion trap to perform parent scanning, neutral loss scanning and selected reaction monitoring.