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The ions effusing ambipolar out of the positive column of a mercury-argon low pressure dis­charge are analyzed in a quadrupol mass spectrometer. Besides the Hg + -ion we find the Hg 2  + -ion molecule. The measured current ratio i(Hg 2  + )/i(Hg + ) in the mass spectrometer is proportional to the mercury vapour pressure pHg in the discharge. i(Hg 2  + )/i(Hg + ) lies between 10 -2  at pHg = 10 -3  Torr and 1 at pHg = 0.1 Torr. - At constant argon- and mercury pressures i(Hg 2  + )/i(Hg + ) is inversely proportional to the discharge current. - At constant discharge current and mercury vapour pressures the ratio i(Hg 2  + )/i(Hg + ) is nearly independent of the argon pressure.

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Massenspektrometrische Analyse der Hg 2  +  -Bildung in der positiven Säule der Hg-Ar-Niederdruckentladung / Mass-spectrometric Analysis of Hg 2  +  Formation in the Positive Column of the Mercury-Argon Low Pressure Discharge