Abstract
The collisional broadening and shift of the fine structure lines of Ca (4s4p(3P0)-4s5s(3S)) perturbed by hydrogen atoms are calculated in a quantum mechanical approach for a wide range of temperatures (4000-5000 K). These results are based on potential energy curves newly calculated in a method which gives a very good description of the electronic states in both the asymptotic region (separated atoms Ca+H) and the molecular region. The results when compared with the usual Van der Waals approximation (asymptotic part of the potential only) show significant discrepancies arising from both the contribution of the intermediate part of the potentials and the effect of the fine structure coupling.
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