Abstract
Evaluation of the distribution function f(p12), where p12 is the momentum difference mod p1-p2 mod , enables the investigation of the concept of a Coulomb hole Delta f(p12) in momentum space. Results are presented for the isoelectronic systems H-, He and Li+. The electron correlation within each CI wavefunction was analysed into its radial and angular components so that the structure and composition of Delta f(p12) could be assessed. The two-particle momentum radial density distribution and several two-particle expectation quantities are also examined. The findings indicate that, in momentum space, the radial components of correlation produce effects characteristic of total correlation in position space whereas, by contrast, angular correlation creates an opposite effect. Thus the shape and formation of Delta f(p12) proves to be considerably more complex than that found for its counterpart in position space.
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