The Dispersion of Standard Air*

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., (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.