Electron impact excitation of the e??· states of Mg, Ca and Sr atoms: Complete experiment results

摘要

We have used non-relativistic and relativistic distorted wave approximation methods to study the excitation of the e?‘?1 e??· states of magnesium (e?‘? = 3), calcium (e?‘? = 4) and strontium (e?‘? = 5) from the ground e?‘?1 e?‘? state. Calculations have been performed for the complete set of parameters $(e???, ilde{L}_{ot}^{+}, ilde{L}_{ot}^{-}, ilde{e???}^{+}, ilde{e???}^{-})$. The results are presented for electron impact energies of 20 and 40 eV. We compare our results obtained from both the non-relativistic and relativistic methods with each other. Good agreement is found on comparison and the importance of relativistic effects is also explored.