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Emission lines of Be-like ions are frequently observed in astrophysicalplasmas, and many are useful for density and temperature diagnostics. However,accurate atomic data for energy levels, radiative rates (A-values) andeffective electron excitation collision strengths ($\Upsilon$) are required forreliable plasma modelling. In general it is reasonably straightforward tocalculate energy levels and A- values to a high level of accuracy. By contrast,considerable effort is required to calculate $\Upsilon$, and hence it is notalways possible to assess the accuracy of available data. Recently, twoindependent calculations (adopting the $R$-matrix method) but with differentapproaches (DARC and ICFT) have appeared for a range of Be-like ions.Therefore, in this work we compare the two sets of $\Upsilon$, highlight thelarge discrepancies for a significant number of transitions and suggestpossible reasons for these.

Electron impact excitation of Be-like ions: a comparison of DARC and ICFT results