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Values of the parameters of the modified Bethe–Bloch theory have been ascertained for kapton by analyzing recent measurements of stopping powers for 0.56–1.54‐MeV protons and 1.08–3.19‐MeV alpha particles. The resulting recommended values of the target parameters are 80.1 eV for mean excitation energy and 1.64 for the Barkas‐effect parameter and 1.86 for a single effective‐charge parameter assigned to the kapton‐alpha particle target–projectile combination. ©1999 John Wiley & Sons, Inc. Int J Quant Chem 75: 943–950, 1999

Recent accurate measurements of the stopping powers of eleven halogenated hydrocarbon compounds for protons and a particles in the respective energy intervals of 0.5-2.1 MeV and 1.6-3.0 MeV have been analyzed in the context of Bethe theory, modified by inclusion of Barkas-effect and Bloch terms. The values of various parameters of the formulation were ascertained through twoand three-parameter fits to the data. The results were generally consistent with anticipated deviations from the additivity rule.PACS number(s): 34.50.Bw, 61.80.Mk

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