Scaling cross sections for ion-atom impact ionization

The scaling cross sections for ion-atom impact ionization by the fully stripped ions were analyzed. The approximate formulas were frequently used, when experimental data and theoretical calculations were not available. A fit for ionization cross sections by fully stripped ions was proposed based on the experimental data and theoretical predictions. The results show that the difference between the proposed fit and the experimental data is within 15% accuracy, which is similar to the estimated uncertainty in the measurements.