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# effective ionization potentials, energy in eV per ion pair
# from G. F. Knoll, Radiation Detection and Measurement, Table 5-1.
argon 26.4
helium 41.3
hydrogen 36.5
nitrogen 34.8
air 33.8
oxygen 30.8
methane 27.3
Ar 26.4
He 41.3
H 36.5
H2 36.5
N 34.8
N2 34.8
O 30.8
O2 30.8
CH4 27.3
# these data apparently from ICRU Report 31, 1979,
# from a presentation of Michael Hale, Dalhousie University
carbon dioxide 33.0
neon 35.4
krypton 24.4
xenon 22.1
CO2 33.0
Ne 35.4
Kr 24.4
Xe 22.1
# and effective ionization potentials for Si and Ge diodes:
Si 3.68
silicon 3.68
Ge 2.97
germanium 2.97
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