Potential energy curves for the 1Σg +, 3Σu+, and 5Σg+ states which arise from two triplet metastable helium atoms (ls 2s3S) have been calculated by a large configuration interaction expansion. From the potential curves for the 1Σg+ and 3Σ u+ autoionizing states, cross section for Penning and associative ionization have been calculated; the total ionization cross section for thermal energy (0.026 eV) collisions, for example, is computed to be 94 Å2. In this low energy region the orbiting model is seen to be adequate for determining the total ionization cross section, but not the more specific cross sections.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry