English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

Holas and March (Phys. Rev. A51, 2040 (1995)) wrote the gradient of theone-body potential V(r) in terms of low-order derivatives of the idempotentDirac density matrix built from a single Slater determinant of Kohn-Shamorbitals. Here, this is first combined with the study of Dawson and March (J.Chem. Phys. 81, 5850 (1984)) to express the single-particle kinetic energydensity of the Be atom ground-state in terms of both the electron density n(r)and potential V(r). While this is the more compact formulation, we then, byremoving V(r), demonstrate that the ratio t(r)/n(r) depends, thoughnon-locally, only on the single variable n'(r)/n(r), no high-order gradientsentering for the spherical Be atom.

Towards an exact orbital-free single-particle kinetic energy density for the inhomogeneous electron liquid in the Be atom