Abstract
Momentum space is used to analyse electron correlation effects for the individual intra- and intershell electron pairs in the ground and first excited states of a series of Li-like ions when 3<or=Z<or=8. Coulomb shifts Delta f(p12) and partial Coulomb shifts Delta g(p12;p1), where p12= mod p1-p2 mod and p1= mod p1 mod , are reported for the pair descriptions K alpha K beta , K alpha L alpha and K beta L alpha in each state. Total Coulomb shifts are also examined. Radial and angular correlations are found to have opposing influences on the interparticle momentum distributions for each electron pair in the ground states and also for the intrashell electron pairs in the first excited states. Such a feature permits the identification of the major component of correlation in different regions of momentum space. Comparisons are made with a previous Z-dependent analysis of these systems in position space.
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