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We present the application of time-of-flight mass spectrometry (TOF  MS) for the analysis of halocarbons in the atmosphere after  cryogenic sample preconcentration and gas chromatographic  separation. For the described field of application, the quadrupole  mass spectrometer (QP MS) is a state-of-the-art detector.  This  work aims at comparing two commercially available instruments, a QP  MS and a TOF MS, with respect to mass resolution, mass accuracy,stability of the mass axis and instrumentsensitivity, detector sensitivity, measurement precision and detectorlinearity. Both mass   spectrometers are operated on the same gaschromatographic system by  splitting the column effluent to both detectors.  The QP MS had to  be operated in optimised single ion monitoring (SIM) mode to achieve  a sensitivity which could compete with the TOF MS. The TOF MS  provided full mass range information in any acquired mass spectrum  without losing sensitivity. Whilst the QP MS showed the performance  already achieved in earlier tests, the sensitivity of the TOF MS was  on average higher than that of the QP MS in the "operational" SIM  mode by a factor of up to 3, reaching detection limits of less than  0.2 pg. Measurement precision determined for the whole  analytical system was up to 0.2% depending on substance and  sampled volume. The TOF MS instrument used for this study displayed  significant non-linearities of up to 10% for two-thirds of all  analysed substances

Comparison of GC/time-of-flight MS with GC/quadrupole MS for halocarbon trace gas analysis