Transmission for a Quadrupole Mass Filter with Dipolar Excitation

Mass peaks are calculated using the numerical simulation of ion trajectories in the linear quadrupole with the dipole excitation(s). Using this data, diagrams for transmission versus resolution are calculated both for the ideal quadrupole field and for the quadrupole field with round rods. It is shown that, using the dipole excitation mode, resolution may be increased from R-0.1 = 1000 to R-0.1 = 2200 with 20% QMF transmission in an ideal case, and, for the round rods, the dipole excitation along the isoline (y) = 0.01 enables an increase in resolution R-0.1 from 500 to 800 at a 20% level of transmission.