Autoionizing resonance profiles in the photoelectron spectra of atomic cadmium

Photoelectron spectra have been taken of atomic Cd with synchrotron radiation between 19 and 27 eV using the double-angle time-of-flight method. Dramatically different energy dependences of the partial cross sections for producing the lowest 2D/sub 5/2/, 2D/sub 3/2/, 2S/sub 1/2/, and 2P/sub 3/2,1/2/ ionic states of Cd+ were observed for photon energies in the neighborhood of the [4d9(5s5p 3P)]2P/sub 3/2/6s 1P1 autoionizing resonance at 588 A. Partial decay widths from the excited resonance state have been determined by fitting the resonance line shapes to theoretical expressions for the partial cross sections. Resonance profiles in the photoelectron angular-distribution asymmetry parameter for the 2D/sub 5/2/ and 2D/sub 3/2/ channels are also reported. The 2P/sub 3/2,1/2/ satellite is found to decrease slightly relative to the 2S/sub 1/2/ main line in the 19--25-eV range. Three new satellite peaks have been detected with intensities enhanced by autoionization