Abstract

An investigation has been made of the extent to which the relative refractivity of the atmosphere is invariant under changes in pressure and humidity. To achieve the necessary precision a refractometer with double-passed chambers 14.3 m long was designed for use in the photographic region. No fiducial line is employed. The relative refractivity of dry air was found to vary by less than 3 × 10−6 over the region from 3890 to 6440 Å for a change in pressure of 12 atm. The relative refractivity of water vapor at low pressure in the region from 3610 to 6440 Å was found to be

δ˜H2O=0.961646+0.0086062k20.00010547k2+0.00001312k6,

where k is the vacuum wave number in μ−1.

© 1962 Optical Society of America

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