Precision measurements of vacuum wavelengths between 3425 and 6907 Å have been made of 95 lines in the spectrum of 86Kr from an Englehard-type lamp operated at the triple point of nitrogen. The accuracy-obtained is of the order of 0.0001 Å. The wavenumbers computed from the experimental data are consistent to 1 mK or better.
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F. M. Phelps (1964) studied this question.
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