Observation of Ar(2p(5)3p(5)nln'l') and Ne(1s2p(5)nln'l') inner-shell doubly excited states

The photoabsorption spectra of neon and argon in the energy region of the 1s2p(5)nln'l' and 2p(5)3p(5)nln'l' doubly excited states have been studied. The resolution and flux of the new VUV undulator beam line at ELETTRA allowed the resolution of new features for Ne and the first observation for Ar. A comparison of the measured photoabsorption spectra and of the threshold photoelectron spectra in the energy region of the Ne+ 1s2p(5)nl and Ar+ 2p(5)3p(5)nl satellite states provides information on the decay routes of the inner-shell doubly excited states.