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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A variatioual calculation of the energy of the 2s2 1S state of helium has been carried out with the use of a wave function of the Hylleraasian type. The wave function is ψ=e-0.2278s{1-0.17079s-0.063155u-0.013869t2 +0.010044u2+0.0064785s2} where s,t u are in units of 4 times the first Bohr radius of hydrogen. The energy is E(2s2 1S)=-1.5412Rh. compared with the value -1.4400 Rh obtained by the method of self-consistent field.

HYLLERAASIAN WAVE FUNCT/ON OF 2s<sup>2</sup> <sup>1</sup>S OF HELIUM