Absolutmessung der Ionisierungsausbeute von Alkaliatomen an Metalloberflächen

Concluding the investigations of the positive surface ionization of alkali metals on incandescent clean polycristalline surfaces^1–3 the absolutely determined ionization coefficientsΒ of cesium on platinum are 1.00 between 1120 and 1700 ?K. A maximum ionization of cesium on tungsten is observed between 1000 and 1340 ?K withΒ very near 1.00. At higher temperatures there is a slight decrease ofΒ in the case of tungsten in agreement with the Saha-Langmuir-equation.