Pioneer Venus large probe neutral mass spectrometer

Details Pioneer Venus large probe neutral mass spectrometer Pioneer Venus large probe neutral mass spectrometer

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jvst...16..692h&link_type=abstract

(American Vacuum Society, National Symposium, 25th, San Francisco, Calif., Nov. 27-Dec. 1, 1978.) Journal of Vacuum Science and

Computer Science

1

Mass Spectrometers, Pioneer Venus Spacecraft, Spacecraft Instruments, Venus Atmosphere, Atmospheric Composition, Calibrating, Carbon Dioxide, Ion Pumps, Rare Gases

Scientific paper

The Pioneer Venus large probe neutral mass spectrometer (LNMS) uses a single focusing magnetic sector field mass analyzer with mass range of 1-208 amu, resolution sufficient to separate the mercury isotopes, and sensitivity sufficient to detect minor constituents in the 1 ppm range relative to the CO2 in the Venus atmosphere. A combination of ion and chemical pumping is used to maintain a vacuum in the mass analyzer and to remove the atmosphere gases which enter the ion source chamber through a special leak. A microprocessor controls the operation of the instrument through a highly efficient peak stepping and data compression program, permitting acquisition of a complete mass spectrum roughly once each minute.

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