Transmission-Resolution Curves for a Quadrupole Mass Spectrometer with Separated RF and DC Fields in the Entrance Aperture.

摘要

The use of an entrance aperture which spatially separates the rf and dc fringe fields in a quadrupole mass filter is shown to improve the transmission-resolution characteristics. We have measured transmission-resolution curves at 28 amu for a quadrupole mass spectrometer with and without a field separating entrance aperture as described by Fite. The aperture design improves the resolution at near unity transmission, the ultimate resolution, and the absolute transmission of the mass filter. (Author)