PARAMETERIZATION OF ANGULAR-CORRELATIONS IN DOUBLE PHOTOIONIZATION TOTHE NEON 2P(4) S-1(E) IONIC STATE

Measurements of the neon 2p(4) S-1(e) triple differential cross sectio n of photoionization have been performed under experimental setups dif fering in such conditions as the electron kinetic energies (equal ener gy sharing), the plane in which the electrons are detected, the degree of linear polarization, and the direction of the first electron. The experimental results are compared with a model which parameterizes the relative magnitudes and phases for the epsilon s epsilon p and epsilo n d epsilon p continuum channels in addition to an electron correlatio n factor. The model is found to reproduce the data rather well, and de pendencies of the angular correlation pattern upon the polarization of the incident light and the contributions from and interference betwee n the continuum Channels are discussed. The fitted values for the rela tive transition strength and phase between the two continuum channels disagree significantly with those of a Hartree-Fock calculation, raisi ng questions about the interpretation of the parameterization.