?quidensitometrie—eine methode zur Beurteilung der struktur von plasmen—IX. Einflu? von NaCl auf die Intensit?t von Spektrallinien und die axiale Teilchenverteilung in Gleichstrombogenplasmen1

The influence of an easily ionizable constituent (NaCl) on the intensities of atomic lines and the axial particle density distribution of Al, Sn, Ag, Si, Sb, and Be in a d.c. arc plasma was investigated. The following methods of investigation were employed: (i) intermediate imaging to determine the total intensity; (ii) direct imaging (with one lens) of the arc axis to establish the axial intensity distribution; (iii) direct imaging of the arc in a slitless spectrograph to obtain arc spectrograms and equidensitograms for the determination of the axial element density distribution and the geometrical shape of the plasma.A result of this investigation is the recognition that optimum total intensities occur even if there is a homogeneous element density distribution. This proves that the phenomena that govern the particle density distribution and intensity optima are interrelated. The results are discussed in detail.