We are looking for a state-of-the-art gas chromatography-mass spectrometry (GC-MS) system that is optimized for structure elucidation and characterization of unknown substances. The configuration includes a gas chromatograph with thermal desorption (ideally with sample recovery, "retrapping" or "recollection") and autosampler for coupling to a high-resolution mass spectrometer (resolution ? 20 k, accuracy ? 1 ppm, scan rate > 10 Hz) with soft ionization to allow alternative coupling with liquid chromatography. For the main application with gas chromatography, the system must have a very good sensitivity even for small substances starting with m/z 50. Ideally, the mass spectrometer allows a change of polarity within the measurement. Other performance parameters include the ability to perform accurate MS/MS analysis with the most precise selection of the precursor ion and the most efficient fragmentation, as well as state-of-the-art software tools for structure elucidation and quantification from complex samples. In addition, the robust operation of the entire device structure with low maintenance requirements should be ensured.

We are looking for a state-of-the-art gas chromatography-mass spectrometry (GC-MS) system that is optimized for structure elucidation and characterization of unknown substances. The configuration includes a gas chromatograph with thermal desorption (ideally with sample recovery, "retrapping" or "recollection") and autosampler for coupling to a high-resolution mass spectrometer (resolution ? 20 k, accuracy ? 1 ppm, scan rate > 10 Hz) with soft ionization to allow alternative coupling with liquid chromatography. For the main application with gas chromatography, the system must have a very good sensitivity even for small substances starting with m/z 50. Ideally, the mass spectrometer allows a change of polarity within the measurement. Other performance parameters include the ability to perform accurate MS/MS analysis with the most precise selection of the precursor ion and the most efficient fragmentation, as well as state-of-the-art software tools for structure elucidation and quantification from complex samples. In addition, the robust operation of the entire device structure with low maintenance requirements should be ensured.