Electron correlation in double photoionization: Comparative study of secondary structure for Ne and Xe

Abstract

The extended Wannier ridge model is shown to be able to reproduce the observed triple differential cross sections (TDCS) for the double-photoionization process y+Ne(2p ) -+Ne +(2p 'S')+e+e at a rather high excess energy E=40.6 eV. The secondary maximum in TDCS is related to the kinematic electron correlation in the initial state just as in the previously studied photoionization of Xe atoms. Variation of TDCS patterns at varying energies for Ne and Xe atom is described.PACS number(s): 32.80. Fb, 34.80.Dp, 34.80.Kw

Experimental observation of initial-state effects in photo-double-ionization of Ne2s

“…Kazansky and Ostrovsky [15] have shown that the relative intensity of the secondary structure in Xe is quite sensitive to the degree of initial-state correlation. On the other hand, the same model predicted TDCS in reasonable agreement with the Ne data discussed above [10][11][12] employing uncorrelated initial-state wave functions [16].…”

Photo-double ionization of molecular hydrogen

“…This result can be established from very general considerations [1,2], and was first derived in the context of the 'Wannier' theory by Huetz et al [3]. The validity of this form has been confirmed not only by the fitting of a large body of experimental data but also by the success of ab initio calculations using a variety of approaches to represent the three-body Coulomb final state [4][5][6]8].…”

“…For increasing k the angular variation shows an increasing number of nodes. Finally, in figure 4 the angular distribution in the laboratory frame, given by T el f i 2 of equation (8), is shown for an energy of 10 eV and various orientations of R with respect to ˆ . At this energy, one notes only a slight dependence upon the orientation of the nuclear axis consistent with figure 3.…”

Ionization transition states of the hydrogen molecular ion in external electric fields

“…In cold plasmas, the strong quasistatic fields [20] between the (almost stationary) positive ions and the electrons cause complete -mixing within n-shells. The field-induced population and depopulation of various -levels [21,22], with their radically different lifetimes, have been implicated in various cross-section [23][24][25] and stability-related phenomena in dilute plasmas [26,27]. The complete symmetry breaking under the influence of the electric and magnetic fields is reminiscent of the crossedfields problem with arbitrary orientations [28,29] except that the zero-order symmetry here is closer to the cylindrical symmetry of the TCC than to the hydrogen atom.…”