Autoionizing resonances 4d→nlin cadmium

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Abstract
We measured the relative cross section and angular distribution parameter for 5s photoelectron emission in atomic cadmium across the region of the 4d→nl autoionizing resonances between 11.70 and 18.05 eV. Our results for the oscillator strengths agree with Hartree-Fock calculations, and are higher than the values reported by other experiments. Strong departure from the direct-process value of 2.0 was observed for the angular distribution parameter β, indicating singlet-to-triplet mixing in the wave functions. The mixing varies in the np resonance series, while it remains almost constant throughout the nf series. In the region of the 5p resonances there is good agreement with a semiempirical calculation of the asymmetry parameter. A number of double-electron excitations were investigated and the value of β was used to give the correct assignment to a transition at 12.856 eV. A previously unobserved transition corresponding to the promotion of a 4d electron to the 5d orbit was detected by the change in the value of β.

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