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

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

2000-05-22

arxiv.org/abs/physics/0005057v1

Physics

Atomic Physics

18 pages, 6 figures, 5 tables

Scientific paper

10.1103/PhysRevA.62.022505

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.

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