The D′ → A′ transition in I2 |
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Authors: | Joel Tellinghuisen |
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Institution: | Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235 USA |
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Abstract: | A detailed vibrational analysis is given for the D′(2g) → A′(2u3Π) transition (3300–3460 Å) in I2. The assignments include ~ 150 v′-v″ bands in 127I2 and ~100 in 129I2, spanning v′ levels 0–15 and v″ levels 4–30. These bands are mainly red-degraded but include some violet-degraded and line-like features. The analysis is corroborated by Franck-Condon and band profile calculations. The least-squares fit yields the following constants (cm?1); ΔTc = 30 340.8, ω′e = 103.95, ωeχ′e = 0.206, ω″e = 106.1, ωeχ″e = 0.81. Anomalous behavior in the vibrational level structure above v″ = 23 makes the extrapolation to the A′ dissociation limit uncertain, so the absolute energies of both states remain ill-defined. However there is a possibility that the D′ state is the state labeled α by King et al. Chem. Phys. 56, 145–156 (1981)], in which case the energies are known precisely. There is evidence of weak emission from at least two other electronic transitions in this spectral region, probably () and β → A(1u3Π) (). |
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