Transition probabilities for Kr I lines from wall-stabilized arc measurements

Transition probabilities for 23 Kr I lines between 431.9 and 892.9 nm pertaining to the 5s-5p and 5s-6p transition arrays were obtained from wall-stabilized arc measurements analyzed under the assumption of a Saha-Boltzmann relationship between the electron density and the population densities of the excited Kr I levels. The electron density (ne=5×1015−2.2×1017cm-3) was calculated from the measured emission coefficient for continuum radiation at 456.1 nm. The electron temperature (T=9500−17 000 K) was determined from measurements of the Kr I 811.3 nm center line intensity by using Kirchhoff's law. The experimental transition probabilities decrease in the direction of larger electron densities. For ne ⩽ 2×1016cm-3 there is agreement with published theoretical transition probabilities and lifetime measurements.