15min:
A GLOBAL FIT OF THE X3 Sigma-g, a1 Deltag, b1 Sigma+g AND B3 Sigma-u STATES OF THE SIX ISOTOPOLOGUES OF OXYGEN .

SHANSHAN YU, CHARLES E. MILLER AND BRIAN J. DROUIN, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109; HOLGER S. P. MÜLLER, I. Physikalisches Institut, Universität zu Köln, 50937 Köln, Germany.

A global fit of the six isotopologues of the O2 molecule has been carried out, with the purpose to support the current and future Earth remote sensing missions. All previously available experimental data from the following systems were collected and used in the analysis: the microwave transitions in the X3 Sigma-g and a1 Deltag states, the infared transitions from the a1 Deltag - X3 Sigma-g, b1 Sigma+g - X3 Sigma-g, and b1 Sigma+g - a1 Deltag systems, the UV transitions from the B3 Sigma-u - X3 Sigma-g Schumann-Runge system. For the main 16O2 isotopologue, experimental data are available for the following vibrational states: v=0-18 for X3 Sigma-g, v=0-1 for a1 Deltag, v=0-17 for b1 Sigma+g, v=0-17 for B3 Sigma-u. A band by band fit was first carried out for these 16O2 data to check bad measurements, misassigments and calibration problems. Then all these 16O2 data were fitted with a Dunham-type model. It was found that most 16O2 data (98%) could be fitted within 3 times experimental accuracies in the band by band fit; the X3 Sigma-g, a1 Deltag, b1 Sigma+g states could be well reproduced with the Dunham-type model; but the vibrational energies for v=0-17 of B3 Sigma-u could not be fitted well with the Dunham-type mode, probably caused by the known perturbations in this state. A band by band fit has been performed for each of the other five minor isotopologues, and a Dunham-type fit is in progress for these data. Eventually data from all the six isotopologues will be simultaneously fitted with a multi-isotopologue Dunham model. We will present the most recent fitting results to date.