# 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
