Atomic data from the IRON Project. XL. Electron impact excitation of the Fe XIV EUV transitions

Abstract

We calculate collision strengths and thermally averaged collision strengths for electron excitation between the forty energetically lowest levels of Fe¹³⁺. The scattering calculation is more complete than any previous work on this ion and significant differences are found in the excitation rates for many of the extreme ultra-violet (EUV) transitions, compared to earlier work. A detailed comparison is made between predicted line intensity ratios and those observed in solar coronal spectra which shows that several outstanding discrepancies are resolved by the new atomic data.