Other
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.3207s&link_type=abstract
American Astronomical Society Meeting 206, #32.07; Bulletin of the American Astronomical Society, Vol. 37, p.482
Other
Scientific paper
Precise knowledge of CO oscillator strengths (f-values) is an important ingredient in modeling this molecule's interstellar distribution, owing to line absorption that dominates CO's photodissociation. High-resolution (R = 25-60,000) FUV absorption spectroscopy from the Super-ACO synchrotron at Orsay, France, is employed to measure new f-values for three CO isotopomers: 12C16O, 13C16O, and 13C18O. We use the f-value of the E-X (0-0) band at 1076 Å as the calibrator of CO column density. A cluster of four interacting Rydberg states between 968-970 Å, K-X (0-0) + L-X (0-0) + L'-X (1-0) + E-X (6-0), is successfully disentangled and modeled by taking into account state interactions according to their mixing coefficients. The derived f-values agree with the larger values found in previous lab work, and with values derived from our FUSE interstellar spectra. Other Rydberg bands are being analysed, including W-X (v'-0; v' = 0 to 3) between 925 and 972 Å, E-X (1-0) at 1051 Å, and B-X (6-0) at 1002 Å, with the last showing marked predissociation lifetime variations from one isotopomer to another. Final f-values will be compared with available results. The authors acknowledge the support of the LURE-SuperACO synchrotron facility through time allocation and the SU5 beam-line team. This work was funded in part by NASA and the CNRS-PCMI program.
Eidelsberg M.
Federman Steven Robert
Fillion Jean-Hugues
Lemaire Jean Louis
Rostas F.
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