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

Photodetachment of H$^-$ near a potential barrier is studied. A new formulais presented for the cross sections induced by a barrier. The new formuladescribes two quantum effects near barrier tops. For energies near and abovebarrier tops, the quantum over-barrier reflection effects are included and theinduced oscillations in the cross sections are still prominent; for energiesnear and below barrier tops, the quantum tunneling across barriers is takeninto account and consequently the oscillations are weakened. For energies faraway from the barrier tops, the new formula agrees with the standardclosed-orbit theory. We demonstrate that a potential barrier of various widthand location can be realized by placing a negative ion near a metal surface andapplying an electric field pointing to the surface. The width and location ofthe barrier can be systematically changed by varying the electric fieldstrength and the distance between the negative ion and the surface. Results arealso presented for estimating the sizes and locations of aforementioned quantumeffects in the cross sections.

Quantum over-barrier reflection effects manifested in the photodetachment cross sections