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

The recoil correction of order $(Z\alpha)^6(m/M)m$ to the hydrogen energylevels is recalculated and a discrepancy existing in the literature on thiscorrection for the 1S energy level, is resolved. An analytic expression for thecorrection to the S-levels with arbitrary principal quantum number is obtained.Comment: 17 pages, ReVTe

physical review a

Recoil corrections of order (Zα<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>(m/M)m to the hydrogen energy levels recalculated

Recoil corrections of order (Zα)6(m/M)m to the hydrogen energy levels recalculated