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

We calculate collision strengths and thermally averaged collision strengths for electron excitation between the forty energetically lowest levels of F e13+. The scattering calculation is mc,re complete than any previous work o n this ion and significant differences are found in the excitation rates fo r many of the extreme ultra-violet (EW) transitions, compared to earlier wo rk. A detailed comparison is made between predicted line intensity ratios a nd those observed in solar coronal spectra which shows that several outstan ding discrepancies are resolved by the new atomic data.