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This paper gives a method to trace quantitatively small quantities of oxygen (down to 10 -3  parts in 1) in mixtures of oxygen and nitrogen. This is based on the effect of the ionization of oxygen molecules in a mixture of oxygen and nitrogen by radiation emitted by nitrogen molecules with ionization potentials U O₂  &amp;lt; U N₂  and the energy of radiation between U O₂  and U N₂ .

Die gasionisierende Strahlung einer Entladung in N 2 -O 2 -Gemischen: (Quantitativen Nachweis kleiner O 2 -Konzentrationen in N 2 )