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By decomposing the initial state wave function into its unique natural orbital expansion we analyze the role of electron correlation in the initial state of an atom or molecule in determining the angular distribution of one-photon double ionization (OPDI). Numerically accurate calculations on the OPDI of He, H− and H2 were considered. For the atomic systems the triply differential cross section (TDCS) was relative insensitively to initial state correlation. However, for oriented H2 the TDCS was particularly sensitive to left-right initial state correlation along the bond.more » « less
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We consider the double photoionization of the 2p2 valence electrons of atomic carbon, which provides for distinct final-state symmetries depending on the three possible angular momentum couplings (3P,1D, and 1S) of the initially-bound p2 electrons that are ejected into the continuum by a single photon. Comparison of this process with neon provides an analogous case for the resulting final states within the treatment of the double photoionization proceeding with the ejected electrons influenced by the remaining bound electrons.more » « less
