Observation of anisotropic angular distribution of ionic fragments in the dissociation of CO2+

Abstract

Angular distributions of fragment ions (${\mathrm{C}}^{+}$+${\mathrm{O}}^{+}$) produced in dissociative double photoionization of carbon monoxide have been studied in the photon energy region 39--100 eV using a photoion-photoion coincidence technique and a source of synchrotron radiation. The asymmetry parameter \ensuremath{\beta} ranges from 0.69 at 39 eV to -0.19 at 100 eV. The observations of anisotropy in the dissociative double photoionization from the valence orbitals of CO are discussed in relation to the symmetry considerations involved in the transition.