New measurements of the infrared dispersion of air are reported. They agree with
series I of the 1962 data of Peck and Khanna, but lie below
Edlén’s 1966 formula. A two-term Sellmeier formula suffices to
fit the resulting infrared (ir) data as well as the data selected by
Edlén in the visible and ultraviolet (uv), being valid down to nearly
0.23 μm. Other possible Sellmeier fits are discussed,
including extension to 0.185 μm.

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Refractivity of standard air at 15 °C in the wavelength range
1.69–0.23 μm. The data and the predictions
of Eq. (2) are tabulated
along with differences between data, Eq. (2) and Eq.
(1).

E, Erickson; S, Svensson; R, Rank et al.; I, series I of
P&K; N, new data.
Point of the set of five first removed from calculation of the rms
deviation.
Point of the set of three next removed from calculation of the rms
deviation.
Point last removed from calculation of the rms deviation.

Table IV

Statistical comparison of the new dispersion formula, Eq. (2), with Edlén’s
1966 formula, Eq. (1). The
factor of 10^{−8} is understood.

Far-uv refractivity of standard air. Data of Traub, recalculated for
15°C and 0.033% CO_{2} content, normalized to 27
789.88×10^{−8} for 0.5462 27
μm, and compared with Eqs. (3), (2), and (1).

Refractivity of standard air at 15 °C in the wavelength range
1.69–0.23 μm. The data and the predictions
of Eq. (2) are tabulated
along with differences between data, Eq. (2) and Eq.
(1).

E, Erickson; S, Svensson; R, Rank et al.; I, series I of
P&K; N, new data.
Point of the set of five first removed from calculation of the rms
deviation.
Point of the set of three next removed from calculation of the rms
deviation.
Point last removed from calculation of the rms deviation.

Table IV

Statistical comparison of the new dispersion formula, Eq. (2), with Edlén’s
1966 formula, Eq. (1). The
factor of 10^{−8} is understood.

Far-uv refractivity of standard air. Data of Traub, recalculated for
15°C and 0.033% CO_{2} content, normalized to 27
789.88×10^{−8} for 0.5462 27
μm, and compared with Eqs. (3), (2), and (1).