Short-range repulsion in the D10+(1Σ+)-state potential of the CdRG (RG = Ar, Kr) molecules determined from a direct continuum ← bound excitation detected at the D10+ ← X10+(1Σ+) transition

The supersonic beam method combined with techniques of laser spectroscopy has been applied to determine the repulsive wall of the D10+(1Σ+) excited-state potential of CdAr and CdKr molecules. The molecules were produced in a continuous supersonic-expansion beam and excited with a dye-laser beam directly from the X10+(1Σ+) to the excited state. Analysis of the laser-induced fluorescence of the unstructured continuum ← bound profiles, recorded for the first time in excitation at the D10+ ← X10+ transition, yielded information on the short range D10+-state potential of the molecules.