Absorption Coefficients of Carbon Monoxide in the 1006–600-Å Wavelength Region

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Abstract
Absorption coefficients, or cross sections, of carbon monoxide have been measured in the 1006–600‐Å wavelength region at a bandwidth of 0.5 Å using the Hopfield helium continuum as background and a photoelectric technique. Strong bands (up to k∼4500 cm—1) were observed from 1006 Å to about 715 Å and weaker bands were found at shorter wavelengths. These bands agree well in location and relative intensity with absorption spectra previously available. Continuous absorption begins at about 960 Å and continues to 600 Å. At wavelengths less than the first ionization potential at 884.7 Å, intense ionization continua are observed. There is one maximum in the continuum of k=710 cm—1 at about 870 Å associated with the CO+ X 2Σ+ state and another maximum of k=950 cm—1 at about 724 Å associated with the CO+ A 2Π i state.