Oscillator Strengths and Predissociation Rates for W - X Bands of CO and Its Isotopologues

Details Oscillator Strengths and Predissociation Rates for W - X Bands of CO and Its Isotopologues Oscillator Strengths and Predissociation Rates for W - X Bands of CO and Its Isotopologues

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21813406f&link_type=abstract

American Astronomical Society, AAS Meeting #218, #134.06; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astrophysics

Scientific paper

The photochemistry of carbon monoxide plays an important role in many astrophysical environments, including photon-dominated regions in interstellar clouds, circumstellar disks around newly formed stars, and the envelopes surrounding stars near the end of their lives. It controls the CO abundance and the ratio of its isotopologues. We are conducting experiments on the DESIRS beam-line at the SOLEIL Synchrotron to acquire the necessary data on oscillator strengths and predissociation rates for modeling CO photochemistry. A VUV Fourier Transform Spectrometer provides a resolving power of about 300,000, allowing us to discern individual lines in electronic transitions. Here we focus on results for W - X (v'=0-3, 0) bands seen in spectra of 12C16O, 13C16O, 12C18O, and 13C18O and compare them with earlier determinations. Since we are using a differentially-pumped system, an accurate measure of the column of gas is needed. The most suitable band for calibration appears to be B - X (0, 0), but even here special care is required.

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