OSCILLATOR STRENGTHS AND PREDISSOCIATION RATES FOR RYDBERG COMPLEXES IN $^{12}$C$^{16}$O BETWEEN 92.9 AND 93.4 NM
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Date
2012
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Ohio State University
Abstract
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 in astronomical environments. A VUV Fourier Transform Spectrometer provides a resolving power of about 350,000, allowing us to discern individual lines in electronic transitions. Here we focus on results for six overlapping bands seen in spectra of $^{12}$C$^{16}$O and compare them with earlier determinations. Absorption from the ground electronic level, $X$ $^1\Sigma^+$ $v^{\prime\prime}~=~0$, to the upper levels 4p$\pi$(2), II $^1\Pi$, 4p$\sigma$(2), 5p$\pi$(0), 5p$\sigma$(0), and I $^1\Pi$ was analyzed. Our results are the first to provide data on each band. The spectra also reveal a continuum feature that was modeled, but its identification is not known at the present time.
Description
Author Institution: Observatoire de Paris, Paris, France; Department of Physics and Astronomy, University of Toledo; Toledo, OH 43606; Department of Physics, Wellesley College, Wellesley; Ma 02481; Observatoire de Paris, Paris, France; Universite PVI UMPC, Paris, France; Observatoire de Paris, Paris, France; IGPP, University of Califormia, Los Angeles, CA 90095; Department of Physics, Wellesley College, Wellesley; Ma 02481; Synchrotron SOLEIL, Saint Aubin, France