Photoelectron images of SO  were collected using 611 nm (2.03 eV), 532 (2.33 eV), and 355 nm (3.49 eV) light. The results are shown in Fig. . The laser polarization axis is vertical in the plane of all images. The left and right halves of the composite images shown represent the raw and Abelinverted data, respectively. Reisler and co-workers' BASEX program was used for inverse Abel transformation. The spectra for all wavelengths are plotted together with respect to electron binding energy, eBE = hv -eKE, where hv is the energy of the photon and eKE is electron kinetic energy. These spectra are compared to the higher-resolution 351.1 nm (3.531 eV) spectrum obtained by Lineberger and coworkers, shown in the same figure in gray. The comparison was used for electronic-vibrational band assignment.