Angle-resolved photoelectron spectrometry studies of the autoionization ofthe 2s(2)2p P-2 triply excited state of atomic lithium: Experimental results and R-matrix calculations

We have measured the angle-resolved energy dependence of the electrons emit ted over the energy range of the triply excited 2s(2)2p P-2 lithium resonan ce using synchrotron radiation. We have also calculated the behavior of the angular distribution parameter beta using the R-matrix approximation. Expe rimental and theoretical results are in good agreement and show deep minima in the 1s2p P-1,P-3 ionic channels, The energy at which the minima occur d oes not coincide with the resonance energy, but is shifted towards higher e nergy.