Electron collisions with Cl₂O using theR-matrix method

The R-matrix method is used to calculate the elastic and excitation cross sections of seven low-lying electronically excited states of the Cl2O molecule. Sixteen states consisting of eight singlets and eight triplets are included in the close-coupled expansion. These states have vertical excitation energies in the range 3.17-8.75 eV, which are in fair agreement with other more sophisticated calculations. We find an electronically bound, but probably dissociative, state of Cl2O- with 2A1 symmetry with an adiabatic electron affinity of 0.4423 eV at the equilibrium geometry of Cl2O. There is a shape dissociative resonance of 2B2 symmetry at 2.096 eV. We also find core-excited shape resonances in 2A1, 2A2, 2B1 and 2B2 symmetries. Cross sections are obtained for rotationally elastic and electronically inelastic scattering for electron impact energies up to 10 eV. Anionic and neutral dissociation products are considered.