Effusion of positive and negative ions from a Knudsen cell with weak electric field and ionic conductivity of the sample

The studies on absolute partial pressure measurements of ionic components of the high temperature vapors over inorganic fluorides by means of Knudsen cell mass spectrometry are summarized. The problems arising when the ions are extracted directly from the effusion cell with electric field are discussed. The conditions for correct determination of the equilibrium constants for gaseous reactions, involving both positive and negative ions, are established.