Absolute oscillator strengths for valence-shell ionic photofragmentations of N2O and CO2 (8–75 eV)

Dipole oscillator strenghts (cross sections) for photoabsorption, photoionisation and photofragmentation of N2O and CO2 have been derived from electron energy loss and electron-ion coincidence measurements in the energy range 8 to 75 eV. The photoionisation efficiency from the ionisation threshold to 60 eV is reported for each molecule. These results have been combined with the partial photoionisation oscillator strenghts for valence-ionised N2O and CO2 derived from earlier electron-electron coincidence experiments in order to investigate the dipole induced fragmentation of each molecule. Comparison is made with previous optical studies of the photofragmentation and photoionisation of N2O and CO 2. Double ionisation in these molecules has also been examined.