15min:

J. XIN, Department of Physics and Engineering Technologies, Bloomsburg University, Bloomsburg, PA 17815; I. IONESCU, D. KUFFEL AND S. A. REID, Department of Chemistry, Marquette University, Milwaukee, WI USA 53233.

We report quantum beat studies of the energy dependence of the Zeeman parameters in the A^{2 +} state of OH and OD, and the nuclear hyperfine parameters of OD(A^{2 +}). In contrast to a previous study, we find that the sign and magnitude of the anisotropic g-factor g_l for '=0 is consistent with that expected from Curl's relationship. However, at higher energies g_l changes sign, and possible explanations for this trend will be examined. The magnetic and electric quadrupole hyperfine constants were determined for OD(A^{2 +}, ' = 0-3), and the constants for ' = 2,3 are reported here for the first time to our knowledge. The derived values are consistent with available ab initio calculations.