Physics
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confewf04t&link_type=abstract
"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec
Physics
Electronic (Uv/Vis/Nir)
Scientific paper
The B-X transition in I_2 stands as one of the most precisely characterized diatomic electronic systems, with thousands of lines having been measured with precision sufficient to serve as frequency standards across the 500-700-nm spectral region. Accordingly the molecular constants of the B-X system permit recalculation of those line positions with similar precision (0.001 cm-1). Yet the B-X electronic transition strength remains a 10-percent quantity, in part from the difficulty of dealing with two overlapping continuous 1u-X transitions, A-X and C-X. In this work, oscillator strengths are estimated from a long-known but little used method -- integration of absorption cross sections over single rotational lines -- using measurements obtained for lines near 650 nm with a diode laser. The results are combined with new, precise low-resolution (1 nm) absorption data to obtain a refined assessment of electronic transition strengths in the I_2 visible absorption spectrum.
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