Contribution of Feshbach resonance to the 1.3-eV dissociative-electron-attachment cross section of ozone

Fixed-nuclei R-matrix calculations for elastic electron-ozone scattering have been performed in the energy region between 0 and 10 eV. Electron correlation has been included extensively in the calculations. Applying the Fano-Feshbach projection operator formalism to the R-matrix results, we can extract from the calculations the positions and the energy-dependent widths of the resonances. The latter were used to estimate the magnitude of the total ion yield. We can show by comparison with experimental results that the low-lying (2)A(2) Feshbach resonance is very likely to be responsible for the observed pronounced maxima in the cross sections for the O- and the O-2(-) channels at 1.3 eV.