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G. D. Zeiss, William J. Meath, J. C. F. MacDonald, D. J. Dawson, Accurate Evaluation of Stopping and Straggling Mean Excitation Energies for N, O, H2, N2, O2, NO, NH3, H2 O, and N2 O Using Dipole Oscillator Strength Distributions: A Test of the Validity of Bragg's Rule, Radiation Research, Vol. 70, No. 2 (May, 1977), pp. 284-303
Zeiss et al. (1977) studied this question.
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