quadrupole mass spectrometer linear quadrupole mass spectrometer CHMO:0002659 A mass spectrometer that uses an orthogonal-acceleration ion source. The detector is a quadrupole mass-to-charge analyser, which holds the ions in a stable orbit using an electric field generated by four linear parallel electrodes. linear quadrupole ion trap mass spectrometer 2010-01-08T03:20:44Z https://orcid.org/0000-0001-5985-7429 LTQ-MS