Abstract

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.,

(n1)108=6432.8+2 949 810(146σ2)1+25 540(41σ2)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.

© 1953 Optical Society of America

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