Mobility and diffusion of protons and deuterons in helium-a runaway effect
- 28 December 1979
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 12 (24) , 4179-4188
- https://doi.org/10.1088/0022-3700/12/24/023
Abstract
The mobility and diffusion of H+ and D+ ions in He gas are calculated classically, based on an accurate ab initio interaction potential. Comparison with corresponding quantal calculations of the zero-field mobility of H+ in He as a function of temperature shows that quantum effects are negligible above 50K, and are only 3% at 10K. Calculations as a function of electric field strength at fixed gas temperature indicate a runaway effect, in which the ions cannot lose enough momentum by collisions to achieve a steady-state average velocity. The drift-tube measurements of Howorka et al. (1979) are consistent with this interpretation.Keywords
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