Calculated [8]  10Z1[5] Measured [i] Measured [ii] H 14.99 10     He 38.83 20 41.8 39.10 Li 34.00 30     Be 38.62 40 63.7 65.28 B 50.22 50     C 61.95 60     N 76.79 70     O 93.28 80     F 111.31 90     Ne 130.94 100 137 133.8 Ar 175.35 180 188 181.6 Kr 329.59 360 352 340.8 i.“Stopping Powers and Ranges for Protons and Alpha Particles,” International Commission on Radiation Units and Measurements (1993). ii. J.F. Janni, “Proton Range-Energy Tables, 1 keV – 10 GeV,” At. Data Nuc. Data Tables, 27, 341-529 (1982).

Table 1: Mean Excitation Energies of Several Atoms (eV)