HIGH-RESOLUTION PHOTOABSORPTION SPECTRUM OF COPPER IN THE 3D SUBSHELLEXCITATION REGION

We report new high-resolution photoabsorption spectra of copper coveri ng the spectral region between 3d subshell excitation using synchrotro n radiation as the background source of continuum. The spectra were re corded in the first order of a 3 m spectrograph equipped with a 6000 l ine/mm holographic grating. Long Rydberg series are observed convergin g to four conspicuous limits built on the 3d(9)4s parent ion configura tions: 3d(10)4s S-2(1/2) --> 3d(9)4s(D-3(3,2,1), D-1(2))np and nf(J = 1). The new high-resolution data reveal numerous examples of interchan nel interactions and autoionization effects that have been parametrize d using the multichannel quantum defect theory.