PHOTOABSORPTION AND NEAR-THRESHOLD ELECTRON-ENERGY-LOSS SPECTROSCOPY OF OCLO

The spectroscopy of chlorine dioxide, OClO, has been investigated usin g the techniques of dissociative electron attachment (DEA), near-thres hold electron energy loss (EEL, 0-10 eV) and optical absorption (2.5-1 0.8 eV). Mass and energy analyses of the ions formed in the DEA proces ses show that at energies above about 3 eV, the product ions are predo minantly near-thermal Cl-, suggesting that the accompanying oxygen ato ms are excited electronically. All features observed in the EEL experi ments are in regions of optical absorption, indicating that the optica lly dark doubler and quartet states have energies which overlap optica lly allowed transitions. The optical spectrum itself is in good qualit ative agreement with previous measurements, but there are differences in relative absorption cross sections. Alternative interpretations of some spectral features are proposed.