Emission Lines from Preionized Levels in Krypton and Xenon

Abstract

In strong rare-gas discharges at relatively high pressures many hitherto unrecorded lines appear which are classified as transitions from preionized $p^{\prime }$ and $f^{\prime }$ levels to normal stable levels. Twenty-four such lines were found in the spectrum of Kr i and thirty in the spectrum of Xe i. The intensity of these lines may be used to measure the ion density.