OSCILLATOR STRENGTHS IN THE VISIBLE ABSORPTION SPECTRUM OF I$_2$

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2010

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Ohio State University

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The BX transition in I2 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 BX system permit recalculation of those line positions with similar precision (~0.001 cm−1). Yet the BX electronic transition strength remains a ~10-percent quantity, in part from the difficulty of dealing with two overlapping continuous 1u-X transitions, AX and CX. 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 I2 visible absorption spectrum.

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Author Institution: Department of Chemistry, Vanderbilt University, Nashville, TN 37235

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