ENERGY-RESOLVED AND ANGLE-RESOLVED (GAMMA,2E) EXPERIMENTS WITH SYNCHROTRON-RADIATION - HELIUM AND ARGON

Typical properties of the triple differential cross section (TDCS) are discussed on the basis of experimental results for helium and argon. The data for helium at excess energies of 20 eV and 10 eV and for equa l energy sharing of the two emitted electrons agree well with the theo retical predictions of an ab initio calculation. The results for argon , 20 eV excess energy and equal energy sharing, allow a comparison of the TDCS for the 3p4 1D(e) and 3p4 P-3(e) final ionic states. For the P-3e state, a tentative interpretation of the data is given within the model of the extended Wannier theory for the relative strength of the two contributing electron-pair wave functions in the continuum, P-3(o ) and 3Do.