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The potential energy curves for six electronic states, X2∑+,A2∏i,B2∑+,C2∏i,D2∑+ and E2∏r of the linear ArCN molecule have been calculated at the ROHF level with the 6-31G* and 6-31G?* basis sets, respectively. The calculation (ROHF) results for the electronic states of ArCN indicate that it is an exciplex. The UHF calculations for the X2∑+ and A2∏i states demonstrate that big spin contaminations in the UHF wavefunctions do not influence the shapes of these two potential energy curves.
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