Theoretical determination of bound-free absorption cross sections in Ar2+

Abstract

Ab initio calculations have been carried out for the potential energy curves and transition moments of the 2Σu+, 2Πg, 2Πu, and 2Σg+ states of Ar2+ which arise from the 2P+1S ion-atom asymptote. These data have been used in a theoretical calculation of the dissociative absorption cross sections from the bound 2Σu+ state to the repulsive 2Πg and 2Σ g+ states. The 2Σu+→2Πg transition, which is dominated by spin-orbit effects, has a maximum absorption cross section of 2.6×10 -19 cm2 centered at 716 nm with a full width at half-maximum of 185 nm at room temperature. The 2Σ u+→2Σg+ transition is found to be much stronger with a maximum cross section of 0.5×10-16 cm2 centered at 300 nm with a full width at half-maximum of 75 nm at room temperature. Copyright © 1977 American Institute of Physics.