Abstract
High-resolution scaled-energy spectra of barium Rydberg atoms in a static electric field are studied. Starting from the 6s5d 3D3 metastable state we investigate Rydberg series converging to the 6s1/2 ionization limit. Spectra at scaled energies = -2.94, -2.35 and -1.76 are recorded and Fourier transformed. Hydrogenic closed-orbit theory, including recent ml = 0 corrections for actions around a bifurcation, reproduces the positions of the peaks but does not reproduce the intensities. A recent extension of closed-orbit theory, incorporating core scattering for nonhydrogenic atoms, is applied. In spite of the success of this technique in analysing scaled-energy spectra for light atoms with one (small) quantum defect the measured intensities in the barium case cannot be reproduced with this method.
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