Computer Science
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..20.1613h&link_type=abstract
Advances in Space Research, Volume 20, Issue 8, p. 1613-1616.
Computer Science
15
Scientific paper
The absorption coefficient k of solid CO_2 has been measured in the wavelength range from lambda=170 nm in the ultraviolet to 333 μm in the far-infrared, except for the strong bands where k>5000 m^-1. This was accomplished by measuring the transmission of clear samples of solid CO_2 grown in equilibrium at 150 K in a chamber whose path length was set between 1.6 and 108 mm. The transmission was measured using both a grating monochromator (lambda<2 μm) and a Fourier transform spectrometer (lambda>1.2 μm). Resolving powers (lambda/Deltalambda) of greater than 5000 were required to measure the narrowest absorption lines in the infrared. The far-infrared lattice-absorption lines are very broad and relatively weak at 150 K compared to lower temperatures. The absorption coefficients in the weakly absorbing ``windows'' between the strong infrared absorption bands are <=1 m^-1, the minimum level which could be measured accurately in this experiment. No absorption was measurable from the near ultraviolet, throughout the visible, to 1.4 mum, except for a few narrow lines at lambda>1 mum.
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