High-resolution absorption cross section measurements of supersonic jet-cooled carbon monoxide between 92.5 and 97.4 nanometers

Astronomy and Astrophysics – Astrophysics

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Absorption Cross Sections, Absorption Spectra, Carbon Monoxide, Cooling, Interstellar Matter, Molecular Clouds, Photochemical Reactions, Supersonic Jet Flow, Far Ultraviolet Radiation, Photodissociation, Spectrum Analysis, Ultraviolet Spectroscopy

Scientific paper

High-resolution photoabsorption cross sections for eight CO bands, at wavelengths between 92.5 nm and 97.4 nm, have been measured in a supersonic jet-cooled source (approximately equals 20 K) at the Photon Factory synchrotron radiation facility. New integrated cross sections are reported for four bands between 92.5 nm and 94.2 nm. A low-temperature spectrum of the W(1)-X(0) band (95.6 nm), which was used to determine the absorbing CO column densities, is also presented. Additional jet-cooled cross section measurements were made on the L(0)-X(0), K(0)-X(0), and W(0)-X(0) bands (96.7-97.4 nm) which verify previously published results. A self-consistent set of band oscillator strengths is presented for the eight bands studied.

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