Abstract
We have measured O 1s photoelectron angular distributions in coincidence with the O+–CO+ fragment ion pairs of CO2 molecules at the photoelectron energies of 90, 120 and 150eV. The observed molecular frame photoelectron angular distributions are left–right asymmetric as a consequence of an enhancement in bond-breaking probability for the CO bond involving the O atom with the 1s hole, compared with the other CO bond. Comparison of the experimental data with the calculations due to our semi-empirical model enables us to deduce the value of 1.4 for this enhancement in the relative bond breaking probability.
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