Physics – Chemical Physics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jchph.115.6459m&link_type=abstract
Journal of Chemical Physics, Volume 115, Issue 14, pp. 6459-6470 (2001).
Physics
Chemical Physics
10
Radio-Frequency And Microwave Spectra, Hyperfine Interactions And Isotope Effects, Jahn-Teller Effect, Rotation, Vibration, And Vibration-Rotation Constants, Rotational Analysis
Scientific paper
Pure rotational spectra of the IO radical have been observed for vibrational levels up to v=13 in the X1 2Π3/2 state and up to v=9 in the X2 2Π1/2 state. Isotopically enriched I18O rotational spectra have been observed for vibrational levels up to v=5 in both the X1 and X2 states. These are the first high-resolution spectra of any kind reported for the X2 state and greatly extend the available data for the X1 state. The data for both isotopomers have been fitted simultaneously to a single set of 2Π parameters with fixed isotopic ratios. The isotope relations among the parameters have provided a means of decorrelating the electron spin-rotation constant γ from the fine-structure centrifugal distortion constant, AD, and have allowed the first determination of an effective value for γ. The rotation-vibration constants correspond to the equilibrium molecular properties re(X1)=186.762 pm, re(X2)=188.468 pm, ωe(X1)=681.69 cm-1, and ωe(X2)=645.29 cm-1. These constants have been used to calculate X1 and X2 Rydberg-Klein-Rees potentials encompassing energies up to 40% of the dissociation limit. A complete set of hyperfine coupling constants has been determined for the first time and interpreted using appropriate relativistic atomic radial integrals.
Cohen Edward A.
Miller Charles E.
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