#mass_spectrometer__spectrometer  spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer
  supertype:  prism_spectroscope__prismspectroscope__spectroscope  an optical instrument for spectrographic analysis
  subtype:  mass_spectrograph  a mass spectrometer that produces a graphical representation of the mass spectrum

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