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

We report energy levels, radiative rates (A-values) and lifetimes for theastrophysically-important Be-like ion C III. For the calculations, 166 levelsbelonging to the $n \le$ 5 configurations are considered and the {\sc grasp}(General-purpose Relativistic Atomic Structure Package) is adopted. EinsteinA-coefficients are provided for all E1, E2, M1 and M2 transitions, whilelifetimes are compared with available measurements as well as theoreticalresults, and no large discrepancies noted. Our energy levels are assessed to beaccurate to better than 1\% for a majority of levels, and A-values to betterthan 20\% for most transitions. Collision strengths are also calculated, forwhich the Dirac Atomic R-matrix Code ({\sc darc}) is used. A wide energy range,up to 21 Ryd, is considered and resonances resolved in a fine energy mesh inthe thresholds region. The collision strengths are subsequently averaged over aMaxwellian velocity distribution to determine effective collision strengths upto a temperature of 8.0$\times$10$^5$ K, sufficient for most astrophysicalapplications. Our data are compared with the recent $R$-matrix calculations ofFern{\'a}ndez-Menchero, Del Zanna \& Badnell [A\&A 566 (2014) A104], andsignificant differences (up to over an order of magnitude) are noted forseveral transitions over the complete temperature range of the results.

Energy levels, radiative rates and electron impact excitation rates for transitions in C III