Electron drift velocities have been measured in helium and hydrogen at 77.6 K and gas density of 6.6×1021 cm−3 (approximately 80 atm). At these high densities the electron drift velocities do not depend only on the ratio of the electric field to gas density (E/N). At constantE/N the electron drift velocity decreases with increasing gas density. In helium a decrease was found down to 6.4% of the value at low density, in hydrogen down to 0.52%.
The results are discussed in terms of theories of multiple scattering. Legler's theory fits our data in the lower density range, but at the highest densities predicts too small an effect. The percolation theory by Eggarter and Cohen gives no agreement with the experiment. Up to the highest densities we did not find bubbles; slow negative charge carriers could be identified as oxygen ions.
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Bartels, A. Density dependence of electron drift velocities in helium and hydrogen at 77.6 K. Appl. Phys. 8, 59–64 (1975). https://doi.org/10.1007/BF00883671
- Drift Velocity
- Density Dependence
- Drift Time
- Density Effect
- Electron Drift Velocity