A method of operating a mass spectrometer having a rod set, comprising: directing ions into the rod set, applying an unbalanced RF voltage to the rod set, and applying a low level resolving DC voltage, e.g. 0.3 to 15.5 volts, to the rod set, thus increasing the sensitivity of the mass spectrometer and...http://www.google.es/patents/US6028308?utm_source=gb-gplus-sharePatente US6028308 - Resolving RF mass spectrometer
