Term diagram of the Ca II model atom. Atomic levels (horizontal bars) are shown with their valence electron configuration nl to theleft, the total angular momentum J on top (as a fraction), grouped by their term configuration 2S+1LP at the bottom row. Bound-bound permitted (solid lines) and forbidden (dashed lines) transitions connect the levels. PRD transitions are indicated in orange. Bound-free transitions (dotted lines) connect their levels to the Ca II continuum (hashed area). For all transitions, the line center or threshold wavelengths are given in Ångströms.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.