Abstract
The refractivity of natural hydrogen gas has been measured at eighteen wavelengths from 0.4047 to 1.6945 μm by means of a corner-reflector interferometer. The resulting refractivity at 0.5462252 μm, and at standard conditions, is 139.304 × 10−6. Sixteen points of our data are well fitted by the dispersion formula 106(n − 1) = 21.113 + 12723.2/(111 − σ2), where σ is wave number in reciprocal micrometers. The combination of our data with recent measurements in the ultraviolet by Smith, Huber, and Parkinson is fitted by the formula 106(n − 1) = [14895.6/(180.7 − σ2)] + [4903.7/(92 − σ2)]. Comparisons are made with the literature in respect to refractivity, dispersion, dielectric constant, molecular polarizability, Rayleigh scattering cross section, and Verdet constant.
© 1977 Optical Society of America
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