Absolute Übergangswahrscheinlichkeiten höherer Ionen

Abstract

It is shown that by solely measuring intensities without explicit knowledge of the plasmatemperature or density absolute transition probabilities in the higher ions can be obtained. To do this one procures a mixture of Helium with the testgas and uses Helium as the “thermometergas” by determining the relative intensities of chosen He I and He II transitions. This measurement, however, is not used to determine an actual temperature but rather to deduce directly the relative populations in the test-gas-ions. This becomes possible if for certain levels a combination of ionization- and exitation potentials results in the same value for Helium and the testgas. An experimental test has been performed with Oxygen as an example and absolute O III-oszillator strength are quoted.