Spectra in the vacuum ultraviolet region of CO in gaseous and solid phases and dispersed in solid argon at 10 K

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With radiation in the region 104–170 nm from a synchrotron and dispersed with a grating monochromator at spectral resolution 0.02–0.03 nm, we measured absorption spectra of 12C16O in the gaseous phase at 303 K and in the solid phase at 10 K, and dispersed in solid argon at molar ratios Ar:CO = 10, 50 and 250 and at 10 K. We assign observed spectral features to transitions to electronic states A 1Π, B 1Σ+, C 1Σ+ and E 1Π from the ground state X 1Σ+. Vibrational progressions are discernible for all these systems of CO in the gaseous phase, but for only the system A—X for CO in the pure solid phase of CO or a dispersion in solid argon; for all condensed phases, multiple series of features are deducible in this vibrational structure.