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- W2022939986 abstract "Direct experimental measurements of electron diffusion coefficients $D$ in helium have been carried out at 300ifmmode^circelsetextdegreefi{}K in the range of $0l~frac{E}{N}l2.7ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}16}$ V ${mathrm{cm}}^{2}$ ($0l~frac{E}{{P}_{0}}l10$ V ${mathrm{cm}}^{ensuremath{-}1}$ ${mathrm{Torr}}^{ensuremath{-}1}$) by an improved electron-density sampling method. Absolute errors less than ifmmodepmelsetextpmfi{} 0.5% are claimed in the range $0l~frac{E}{N}l9ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}17}$ V ${mathrm{cm}}^{2}$ and less than 1.5% in the range $9ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}17}lfrac{E}{N}l2.7ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}16}$ V ${mathrm{cm}}^{2}$.The obtained values of $D$ are in agreement with those of Crompton, Elford, and Jory in the range of $2.124ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}19}l~frac{E}{N}l~3.03ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}17}$ V ${mathrm{cm}}^{2}$ studied by these authors. Also measurements of $ensuremath{alpha}W$ (where $ensuremath{alpha}$ is Townsend's first coefficient and $W$ the drift velocity) have been performed in the range $9.03ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}17}l~frac{E}{N}l~2.6ifmmodetimeselsetexttimesfi{}{10}^{ensuremath{-}16}$ V ${mathrm{cm}}^{2}$ (corresponding to $3.2l~frac{E}{{P}_{0}}l~10$ V ${mathrm{cm}}^{ensuremath{-}1}$ ${mathrm{Torr}}^{ensuremath{-}1}$). Values of $ensuremath{alpha}$ with an accuracy evaluated at ifmmodepmelsetextpmfi{} 10% are obtained by dividing $ensuremath{alpha}W$ by the $W$ values found in the literature. These $ensuremath{alpha}$ values are to be compared with those of the literature, which are dispersed by a factor of 3 in the above range." @default.
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- W2022939986 title "Measurements of Lateral Diffusion Coefficients and First Townsend Coefficients for Electrons in Helium by an Electron-Density Sampling Method" @default.
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- W2022939986 doi "https://doi.org/10.1103/physrev.179.186" @default.
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