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/

Global: Zendy Plus annual

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

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The hydrogen molecules $H_2$ and $(H_2)_2$ are analyzed with electroniccorrelations taken into account between the $1s$ electrons exactly. The optimalsingle-particle Slater orbitals are evaluated in the correlated state of $H_2$by combining their variational determination with the diagonalization of thefull Hamiltonian in the second-quantization language. All electron--ioncoupling constants are determined explicitly and their relative importance isdiscussed. Sizable zero-point motion amplitude and the corresponding energy arethen evaluated by taking into account the anharmonic contributions up to theninth order in the relative displacement of the ions from their staticequilibrium value. The applicability of the model to the solid molecularhydrogen is briefly analyzed by calculating intermolecular microscopicparameters for $2 \times H_2$ rectangular configurations.

new journal of physics

$H_2$ and $(H_2)_2$ molecules with an ab initio optimization of wave  functions in correlated state: Electron-proton couplings and intermolecular  microscopic parameters