title: Some simple modifications to the LKB 9000S to achieve improved selected ion monitoring and repetitive scanning performance.
abstract: Modifications are described to the electron multiplier pre-amplifier, selected ion monitor, magnet current supply and scan controller of the LKB 9000S gas chromatograph mass spectrometer. The modifications described have secured an improved performance for specific ion monitoring and fast repetitive scanning gas chromatography mass spectrometry.
mesh_terms: D000731:Androstanes / Q000032:analysis; D002849:Chromatography, Gas / Q000295:instrumentation; D013058:Mass Spectrometry / Q000295:instrumentation*
chemical_list: D000731:Androstanes