Electron collisions with OClO using the R-matrix method

The R-matrix method is used to calculate elastic and excitation cross secti ons of four low-lying electronic states of the OCIO molecule, designated as the (XB1)-B-2, 1 (2)A(1), 1 B-2(2) and 1 (2)A(2) states. Eight states, fou r doublets and four quartets are included in the close-coupled expansion; t hese excited states are predicted to have vertical excitation energies in t he range 2.956-8.206 eV, in fair agreement with published multireference co nfiguration-interaction calculations. The experimentally determined excitat ion energy of the atmospherically most important state 1 (2)A(2) centred ar ound 3.5 eV is in excellent agreement with our value of 3.44 eV. A bound st ate of OCIO- with (1)A(1) symmetry with an adiabatic electron affinity of 1 .558 eV at equilibrium geometry of OCIO is found. There is a shape resonanc e of B-3(1) symmetry at 2.96 eV and higher-lying shape resonances of B-1(1) , (1)A(2) and (3)A(2) symmetries located at 5.75, 8.06 and 7.22 eV, respect ively. All the resonances are rather broad. The resonance positions correla te well with the maxima found in dissociative electron attachment cross sec tion measurements. Rotationally inelastic scattering cross sections are com pared with experiment and there is very good agreement for electron energie s above 100 meV. Excitation cross sections for three excited states are pre sented for electron-impact energies up to 10 eV. Total integral cross secti ons are also compared with experiment.