Angular correlation in the two-electron continuum

doi:10.1103/PHYSREVA.73.020708

Abstract

Following absorption of a single photon, angles of simultaneous emission of two electrons from a He(n {sup 1}S) atom become more correlated with increasing n. We find that the strength of this correlation is due to the two-electron continuum of the electron-impact ionization of the He{sup +}(ns) ion. The strength is determined by the width of the momentum profile of the ionic ns state but not the strength of the electron correlation in the He initial state. This can explain the increasing (over He) angular correlation strength found in double photoionization of targets such as Be, Ne, and H{sub 2}.

Evidence for electron correlation in the two-electron continuum during double ionization in 300-keV H sup + +He collisions

Skogvall, B. ; Schiwietz, G. December 1990 - Physical Review Letters; (USA)

Absolute differential ionization probabilities for small impact parameter H{sup +}+He collision were measured as a function of the electron energy, electron ejection angle, and final recoil-ion charge state. Good agreement was found between an experimental angular distribution of ejected electrons and results of a coupled-channel calculation in the case of single ionization. In the case of double ionization, significant discrepancies to theoretical predictions are found, indicating a breakdown of the independent electron model. Furthermore, evidence is provided that dynamic correlation effects in the two-electron continuum strongly influence the angular distribution of ejected electrons for double ionization.
DOI: 10.1103/PhysRevLett.65.3265
Correlation and Negative Continuum Effects for the Relativistic {ital M}{bold 1} Transition in Two-Electron Ions using the Multiconfiguration Dirac-Fock Method

Indelicato, P. October 1996 - Physical Review Letters

The role of the {ital E}{lt}{minus}{ital mc}{sup 2} continuum and of correlation in the multiconfiguration Dirac-Fock calculation of nondiagonal one-electron operators is described. Because of its importance and symmetry which emphasize both effects, we study the 1{ital s}2{ital s}{sup 3}{ital S}{sub 1}{r_arrow}1{ital s}{sup 2}{sup 1}{ital S}{sub 0} relativistic {ital M}1 transition in two-electron ions. It is shown that both contributions have the same magnitude, and must be included even at low {ital Z}. These contributions improve significantly the agreement between theory and experiment at all {ital Z}, reducing the disagreement for Nb from 2.7 to {minus}1.8 times the experimental error.more »« less
DOI: 10.1103/PhysRevLett.77.3323
Attosecond Electron Correlation Dynamics in Double Ionization of Benzene Probed with Two-Electron Angular Streaking

Winney, Alexander H. ; Lee, Suk Kyoung ; Lin, Yun Fei ; ... September 2017 - Physical Review Letters
Cited by 2
DOI: 10.1103/PhysRevLett.119.123201
One-photon annihilation in the Ps[sup [minus]] ion and the angular ([ital e][sup [minus]],[ital e][sup [minus]]) correlation in two-electron ions

Frolov, A.M. ; Smith, V.H. Jr. May 1994 - Physical Review A; (United States)

Various properties of the Ps[sup [minus]] ion in its bound ground ([sup 1][ital S]) state are calculated from a very accurate explicitly correlated wave function. From the expectation value for the triple delta function [l angle][delta][sub 321][r angle]=[vert bar][psi](0,0,0)[vert bar][sup 2] we estimate the one-photon annihilation rate [Gamma][sub [gamma]] in the Ps[sup [minus]] ion and show that [Gamma][sub [gamma]][much lt][Gamma][sub 3[gamma]][much lt][Gamma][sub 2[gamma]]. The statistical angular correlation coefficients are analyzed for the series of two-electron ions ([ital e][sup [minus]][ital e][sup [minus]][ital Z][sup +]) which includes T[sup [minus]], D[sup [minus]], H[sup [minus]], Mu[sup [minus]], and Ps[sup [minus]].
DOI: 10.1103/PhysRevA.49.3580
Annihilation rate and the two $gamma$-ray angular correlation produced by an electron positron pair in an e$sup +$--H system

Wakid, S.E.A. February 1974 - Phys. Lett., A, v. 46A, no. 7, pp. 493-494

Using a wave iunction, previously developed for a positronhydrogen atom scattering and which exhibits the best, so far, bound; the above two experimentally measurable parameters are evaluated for energies up to the positronium threshold. (auth)

Title: Angular correlation in the two-electron continuum

Abstract

Citation Formats

Evidence for electron correlation in the two-electron continuum during double ionization in 300-keV H sup + +He collisions

Correlation and Negative Continuum Effects for the Relativistic {ital M}{bold 1} Transition in Two-Electron Ions using the Multiconfiguration Dirac-Fock Method

Attosecond Electron Correlation Dynamics in Double Ionization of Benzene Probed with Two-Electron Angular Streaking

One-photon annihilation in the Ps[sup [minus]] ion and the angular ([ital e][sup [minus]],[ital e][sup [minus]]) correlation in two-electron ions

Annihilation rate and the two $gamma$-ray angular correlation produced by an electron positron pair in an e$sup +$--H system