Predicted predissociation linewidths in the Schumann-Runge bands of O-2 compared with recent high resolution measurements

We derive and use new parameters to quantify the semiempirical expressions of Julienne and Krauss [J. Mol. Spectrosc. 56, 270 (1975)] for the (5)Pi (u ), (3)Sigma (+)(u), (3)Pi (u), and (1)Pi (u) potentials that predissociate the rovibrational levels of the B (3)Sigma (-)(u) state of O-2. Using the n ew parameters in the model of Julienne and Krauss we evaluate fine-structur e predissociation linewidths for the Schumann-Runge bands that terminate on the v=13,14 rovibrational levels of the B (3)Sigma (-)(u) state. We compar e these linewidths and those calculated with several existing sets of param eters with the measurements of Dooley [J. Chem. Phys. 109, 3856 (1998)]. We also show the deperturbing effect of the level shifts, calculated with the new parameters, on the energies of the rotationless v=0-17 vibrational lev els of the B (3)Sigma (-)(u) state. (C) 2001 American Institute of Physics.