Primary ionization coefficients for dry and moist air; secondary ionization coefficients for a water surface |
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| Authors: | R R Stout G A Dawson |
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| Institution: | (1) Institute of Atmospheric Physics, The University of Arizona, 85721 Tucson, Arizona, USA |
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| Abstract: | Summary A comparison has been made between the Townsend primary ionization coefficient,  , for dry air and for air with humidities typical of those in the atmosphere. is defined as the number of new electrons produced by an electron per centimeter of drift in a field. A range of field/pressure ratios,E/p
0, of 40 to 100 V (cm torr)–1 was employed. The variation of with humidity is very small.Over the range ofE/p
0 from 50 to 100 V (cm torr)–1, the secondary ionization coefficient,  , of a water surface has been found from sparking potential data to be typically 2×10–4. represents the fraction of primary ionizing collisions that ultimately result in the production of additional electrons at the surface. |
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| Keywords: | Ionization of moist air of dry air Coefficient for a water surface |
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