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Accurate transition rates for the 5 p − 5 s transitions in Kr I

2000; American Physical Society; Volume: 62; Issue: 2 Linguagem: Inglês

10.1103/physreva.62.022505

1538-4446

Krzysztof Dzierżęga, U Volz, Gillian Nave, Ulf Griesmann,

Laser-induced spectroscopy and plasma

Branching fractions were measured for electric dipole transitions from the 5p upper levels to the 5s levels in neutral krypton atoms. The measurements were made with a wall-stabilized electric arc and a 2m monochromator for the spectral lines in the visible, and with a hollow cathode lamp and the NIST 2m-Fourier transform spectrometer for the lines in the near infrared. A semi-empirical calculation, based on accurately known lifetimes for six upper levels, was used to calculate lifetimes for which accurate measurements do not exist. This resulted in a complete set of lifetimes for all 5p levels. Branching fractions and lifetimes were used to calculate transition rates for the 5p-5s transitions. The relative uncertainties of the transition rates range from less than 1% for the strongest lines to about 10% for the weakest lines. Our data also reveal that most of the previous measurements appear to have been affected by opacity effects in the light sources.