SEARCH Articles Figures Tables 3D Quadrupole ion trap mass spectrometer Ion trap Ion trapping Ion-quadrupole Mass quadrupole Mass spectrometer quadrupole Mass spectrometer trapping Mass trapping Quadrupol mass spectrometers Quadrupole ion trap Quadrupole ion trap -time of flight mass spectrometer Quadrupole linear ion trap mass spectrometers Quadrupole spectrometers Quadrupole trap Trapped ions Trapping quadrupole