<?xml version="1.0" encoding="UTF-8"?>

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  <Version>2.3.1</Version>

  <Instrument>

    <ResourceID>spase://CNES/Instrument/CDPP-AMDA/MAVEN/NGIMS</ResourceID>

    <ResourceHeader>
      <ResourceName>NGIMS</ResourceName>
      <AlternateName>Neutral Gas and Ion Mass Spectrometer</AlternateName>
      <ReleaseDate>2017-03-01T22:37:00Z</ReleaseDate>
      <Description>The Neutral Gas and Ion Mass Spectrometer (NGIMS) measures the composition and isotopes of thermal neutrals and ions.
        
      Goals:
    *Determine structure and variation of neutral atmosphere and ionosphere with altitude over the globe from the homopause to above the exobase where the neutral gas can escape
    *Provide a basis for the study of thermospheric energetics, transport, circulation and formation of the ionosphere
    *Reveal the effects of lower atmospheric effects on the composition of the upper atmosphere and escape

   Observations:
    *Basic structure of the upper atmosphere (major species He, N, O, CO, N2, NO, O2, Ar, and CO2) and ionosphere from the homopause to above the exobase
    *Stable isotope ratios, and variations

 Technical details and heritage:
    *Quadrupole Mass Spectrometer with open and closed sources
    *Open source: neutrals and ions
    *Closed source: non-reactive neutrals
    *Mass Range: 2 – 150 Da
    *Mass Resolution: 1 Da
    *Modes: scan entire spectra or adapt to fixed masses
    *Sensitivity: 10-2 (counts/s)/(particles/cm-3)
    *Heritage from Galileo GPMS, Pioneer Venus ONMS, CASSINI INMS, Contour NGIMS   
   </Description>
      <Contact>       
        <PersonID>spase://SMWG/Person/Paul.R.Mahaffy</PersonID>
        <Role>PrincipalInvestigator</Role>
      </Contact>
      <InformationURL>
        <Name>NGIMS web page, Summary sheet </Name>
        <URL>http://lasp.colorado.edu/home/maven/science/instrument-package/ngims/</URL>
      </InformationURL>      
    </ResourceHeader>
    <!-- Quadroupole Mass Spectrometer -->
   <InstrumentType>MassSpectrometer</InstrumentType>
   <InvestigationName/>
    <OperatingSpan>
      <StartDate>2013-11-18T13:28:00</StartDate>
      <!--StopDate>2014-12-16T00:00:00</StopDate-->
      <!-- Note :  Mission phases : multiple tags possible -->
      <Note>Mars arrival : 2014-09-28T19:24:00</Note>
    </OperatingSpan>

    <ObservatoryID>spase://CNES/Observatory/CDPP-AMDA/MAVEN</ObservatoryID>

  </Instrument>
</Spase>