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By combining Barrell and Sears’ measurements in the visible and Koch’s and Traub’s in the ultraviolet, a dispersion formula for standard air has been derived, viz., (n−1)108=6432.8+2 949 810(146−σ2)−1+25 540(41−σ2)−1,σ being vacuum wave number in μ−1, which should satisfy all needs of precision spectroscopy, in particular for converting wavelengths in air into vacuum values.
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Bengt Edlén (1953) studied this question.
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