Abstract
Radial intensity distribution of spectral lines in Cu-hollow-cathode discharge, in Ne, A and Xe, are measured as a function of gas pressure P. At lower pressures the maximum. intensities of Cu and rare gas lines are all located at the center of the cathode (1st type). With increasing pressure the maximum position shifts toward the circumference of the cathode (2nd and 3rd types). The pressure at which the position of the maximum intensity makes a transition from the 1st to the 3rd type is about 8 Torr in Ne, 4 Torr in A and 2.7 Torr in Xe. These pressures are inversely proportional to the ratio of the collision cross section of each gas. It is obtained experimentally that the changes in the intensity at the maximum-intensity-position with pressure can be represented by I=kP+C (k<0) for the gas lines and I'= k' log (1/P) +C' for the Cu lines.
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