Methode zur Bestimmung der radialen Verteilung von Teilchen im Grund-und angeregten Energiezung in einer Bogenentladung

A method using a single spectral line for determining simultaneously the distribution of atoms in two different levels of energy and consequently the radial distribution of temperature in a d.c. arc has been worked out.

The principles of this method are as follows:

Two transverse images—one above the other—of the light source are formed on the slit of a spectrograph by means of illuminations systems describe. In one the images the arc in addition is uniformly illuminated from behind by its own radiation. By means the intensity distribution along the same spectral line in both images the radial distribution of the module of extinction (extinction per unit length), which is proportional to the concentration of atoms in the ground state of energy, as well as the radial distribution of emission coefficients (true radiation intensity per unit length), which is proportional to the concentration of atoms in the excited state belonging to the spectral line in question, can be determined. Finally the radial distribution of temperature in the light source can then be calculated.