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- Title
Townsend's Ionization Coefficient for Helium.
- Authors
DUNLOP, S. H.
- Abstract
ACCURATE experimental data are lacking for Townsend's ionization coefficient α/p for electrons drifting through helium, when the ratio X/p of electric field to pressure is small. As has been pointed out by Loeb1, however, it is possible in this instance to calculate α/p from the relation2 where W is the drift velocity of the electrons, v the speed of an electron which has energy V in its random motion, f(V) the energy distribution function in the random motion, I the ionization energy, and P(V) the probability of ionization for an electron with energy V per unit random path at unit pressure, since the form of f(V) has been determined with considerable accuracy by Smit3.
- Publication
Nature, 1949, Vol 164, Issue 4167, p452
- ISSN
0028-0836
- Publication type
Article
- DOI
10.1038/164452a0