M. T. Macpherson, J. P. Simons, and R. N. Zare,”Polarized Photofluorescence Excitation Spectroscopy Calculation of the Degree of Polarization of the Fluorescence from Diatomic Molecular Fragments Produced through Photodissociation of Triatomic Molecules,”Mol. Phys. 38, 2049-2055 (1979).