High resolution spectral analysis of oxygen. IV. Energy levels, partition sums,...
We have updated the isotopically invariant Dunham fit of O2 with newly reported literature transitions to derive (1) the energy levels, partition sums, band-by-band molecular constants, and RKR potentials for the X3 Sigma−g , a1 Delta g, and b1 Sigma+g states of the six O2 isotopologues: 16O16O, 16O17O, 16O18O,17O17O, 17O18O, and 18O18O; (2) Franck-Condon factors for their a1 Delta g − X3 Sigma−g , b1 Sigma+g − X3 Sigma−g , and a1 Delta g − b1 Sigma+g band systems. This new spectroscopic parameterization characterizes all known transitions within and between the X3 Sigma−g , a1 Delta g, and b1 Sigma+g states within experimental uncertainty and can be used for accurate predictions of as yet unmeasured transitions. All of these results are necessary to provide a consistent linelist of all transitions which will be reported in a followup paper.