Excitation spectra of the CdKr excimer were produced in a molecular beam employing free-jet supersonic expansion, crossed with a pulsed dye-laser beam. Bands arising from 81+ -XO+ and AO+~XO+ vibronic transitions were analyzed, yielding spectroscopic constants for the three states. Computer simulations of the bands yielded relative values of r" the equilibrium internuclear separations.Potential-energy curves constructed on the basis of the data and of the Morse potential provided a useful comparison with theoretically calculated curves.PACS number(s): 33.20.Lg, 33.50.Dq