Absolutmessung der Ionisierungsausbeute von Alkaliatomen an Metalloberflächen

Continuing the systematic measurements of the positive surface ionization of alkali metals on incandescent clean polycrystalline surfaces the present absolute determination of the ionization coefficientβ of rubidium on platinum surfaces gives a value of 1.00 between 1200 and 1700 °K. A maximum ionization coefficient ofβ=0.95 was observed for the system Rb/W at a temperature of about 1150 °K. The ionization at higher temperatures and there the dependence on temperature are in agreement with the Saha-Langmuir-equation.