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The Gas Chromatograph Mass Spectrometer for the Huygens Probe |
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| Authors: | Niemann HB Atreya SK Bauer SJ Biemann K Block B Carignan GR Donahue TM Frost RL Gautier D Haberman JA Harpold D Hunten DM Israel G Lunine JI Mauersberger K Owen TC Raulin F Richards JE Way SH |
| Institution: | (1) Institute for Meteorology and Geophysics, University of Graz, A-8010 Graz, Austria;(2) Member Investigation Team, USA;(3) University of Michigan, Ann Arbor, MI 48109, USA;(4) Massachusetts Institute of Technology, Cambridge, MA 01239, USA;(5) University of Michigan, Ann Arbor, MI 48109, USA;(6) University of Alabama, CMC, 817 22nd Street, South Birmingham, AL 35205, USA;(7) Observatoire de Paris-Meudon, F-92195 Meudon Cedex, France;(8) National Aeronautics and Space Administration, Greenbelt, MD 20771, USA;(9) University of Arizona, Tucson, AZ 85716, USA;(10) Service d'Aéronomie du CNRS, F-91371 Verrières le Buisson Cedex, France;(11) University of Hawaii, Honolulu, HI 96822, USA;(12) Laboratoire Interuniversitaire des Systèmes Atmosphériques, Université Paris 12 et Paris 7, Avenue du général de Gaulle, F-94010 Creteil Cedex, France |
| Abstract: | The Gas Chromatograph Mass Spectrometer (GCMS) on the Huygens Probe will measure the chemical composition of Titan's atmosphere from 170 km altitude (∼1 hPa) to the surface (∼1500 hPa) and determine the isotope ratios of the major gaseous constituents. The GCMS will also analyze gas samples from the Aerosol Collector Pyrolyser (ACP) and may be able to investigate the composition (including isotope ratios) of several candidate surface materials. The GCMS is a quadrupole mass filter with a secondary electron multiplier detection system and a gas sampling system providing continuous direct atmospheric composition measurements and batch sampling through three gas chromatographic (GC) columns. The mass spectrometer employs five ion sources sequentially feeding the mass analyzer. Three ion sources serve as detectors for the GC columns and two are dedicated to direct atmosphere sampling and ACP gas sampling respectively. The instrument is also equipped with a chemical scrubber cell for noble gas analysis and a sample enrichment cell for selective measurement of high boiling point carbon containing constituents. The mass range is 2 to 141 Dalton and the nominal detection threshold is at a mixing ratio of 10− 8. The data rate available from the Probe system is 885 bit/s. The weight of the instrument is 17.3 kg and the energy required for warm up and 150 minutes of operation is 110 Watt-hours. This revised version was published online in August 2006 with corrections to the Cover Date. |
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