Development of Quadrupole Mass Spectrometer

摘要

An electric quadrupole mass spectrometer has been developed to cover 1 to 400 amu in four ranges. The electronic circuits that supply voltages to the mass filter are capable of 50:1 spectral-range sweeps in 0.1 sec, but resolution over a wide sweep range is limited by nonlinearity in the control of the r-f voltage. Compensation reduces nonlinearity over a 10:1 sweep range from 4 to 0.4%. The electron-multiplier ion collector is operated as a particle detector to eliminate the effects of multiplier gain variations. High-speed circuits (resolving times