Electron Scattering from the Ground and Excited States of Barium

Abstract

We have used the nonrelativistic convergent close-coupling (CCC) method to investigate electron scattering from the ground (6s²)¹S state and excited (6s6p)¹ P^o₁ and (6s5d)^1,3D^e₂ states of barium. For the scattering from the barium ground state, we have found very good agreement with measurements of (6s6p)¹ P^o₁ apparent cross sections at all energies. Similarly, good agreement is found for differential cross sections for elastic scattering and (6s6p)¹ P^o and (6s5d)¹ D^e₂ excitations and with the (6s6p)¹ P^o₁ state electron{photon angular correlations. For the scattering from excited states of barium we have found good agreement with elastic (6s6p)¹ P^o₁ scattering and the (6s5d)¹D^e₂ → (6s6p)¹ P^o₁ transition for both differential cross sections and electron–photon angular correlations.