Computer Science
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976josa...66..122p&link_type=abstract
Optical Society of America, Journal, vol. 66, Feb. 1976, p. 122-124. NASA-supported research.
Computer Science
7
Aqueous Solutions, Infrared Spectra, Optical Measurement, Spectral Reflectance, Sulfuric Acid, Absorption Spectra, Incident Radiation, Refractivity, Spectrum Analysis, Temperature Effects
Scientific paper
Results are presented for measurements of the IR spectral reflectance at near-normal incidence of aqueous solutions of sulfuric acid with acid concentrations of 75% and 95.6% by weight. Kramers-Kronig analyses of the reflectance data are employed to obtain values of the optical constants n(nu) and k(nu) in the spectral range from 400 to 6000 cm to the -1 power. The optical constants of these solutions at 250 K and 300 K are compared. It is found that in spectral regions remote from strong absorption bands, the values of the n(nu) indices obtained at 250 K agree with the values given by Lorentz-Lorenz correction of the same indices at 300 K. All absorption bands observed at 300 K are found to be present at 250 K with slight shifts in frequency and with significant differences in the k(nu) indices at the band maxima. Based on these results, it is concluded that the clouds of Venus probably consist of droplets of aqueous solutions of sulfuric acid with acid concentrations of about 75% by weight.
Pinkley L. W.
Williams David
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