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Cross sections for the emission of Auger electrons from excited atoms and ions produced in symmetric Ar + -Ar and Ne + -Ne collisions have been measured at ion energies from 50 to 300 keV. A simple model is proposed to explain the dependence of the cross section on the impact energy; the predicted results agree well with the experiment. Also, the argon x-ray data of Saris and Onderdelinden are compared with the model and with the results of this experiment. Cross sections for the emission of Auger electrons from excited atoms and ions produced in symmetric Ar'-Ar and Ne+-Ne collisions have been measured at ion energies from 50 to 300 keV. A simple model i s proposed to explain the dependence of the cross section on the impact energy; the predicted results agree well with the experiment. Also, the argon x-ray data of Saris and Onderdelinden a r e compared with the model and with the results of this experiment. Published in Physical Review