EXPERIMENTAL INVESTIGATION OF KRYPTON SPECTRA

The spectra of a wall-stabilized arc operated at atmospheric pressure in krypton, or mixtures of krypton and helium, were investigated under the assumption of local thermodynamic equilibrium (LTE). The electron density (ne = 5 × 1015 - 1.9 × 1017 cm-3, corresponding to an LTE temperature T = 9000-13300 K) was determined with a maximum error of 4-6% from laser interferometric measurements of the plasma refractivities at 632.8 and 1152.3 nm. For the spectral range between 400 and 570 nm ξ factors (± 15%) for continuum radiation were obtained which decrease in the direction of larger electron densities. Application of correction factors given by Preston to the measured intensity of the Kr I 450.2 nm line resulted in a transition probability independent of the plasma state, Anm = 5.1 × 105 s-1, with a 7% standard deviation. Altogether transition probabilities for four Kr I lines (±20%) and six Kr II lines (±30%), and the Stark broadening constant of the 450.2 nm line were obtained. © 1979.