Ratio of the Diffusion Coefficient to the Mobility Coefficient for Electrons in He, Ar,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">N</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">D</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>, CO, and C<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>at Low Temperatures and Low<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mi>E</mml:mi></mml:mrow><mml:mrow><mml:mi>p</mml:mi></mml:mrow></mml:mfrac></mml:math>

1962107 citationsJournal Article

Authors

Roger W. Warren · Westinghouse Electric (United States)

J. H. Parker · Westinghouse Electric (United States)

Abstract

$\frac{D}{\ensuremath{\mu}}$, the ratio of the diffusion coefficient to the mobility coefficient for electrons, has been determined as a function of $\frac{E}{p}$, the ratio of the electric field to pressure, in He, Ar, ${\mathrm{N}}_{2}$, ${\mathrm{H}}_{2}$, ${\mathrm{D}}_{2}$, CO, and C${\mathrm{O}}_{2}$. Special interest is centered on the low-temperature, low-$\frac{E}{p}$ data which are essential for the determination of low-energy elastic and inelastic cross sections. The lowest temperature of operation is either 77\ifmmode^\circ\else\textdegree\fi{}K or the boiling point of the gas being measured, whichever is higher. The lowest $\frac{E}{p}$ value is well within the thermal range where $\frac{D}{\ensuremath{\mu}}=\frac{\mathrm{kT}}{e}$. A careful analysis of the operation of the experimental tube is presented along with a method for removing inconsistencies in the results which arise from a conventional interpretation of the data.

Topics & Keywords

Advanced Chemical Physics Studies Catalysis and Oxidation Reactions Catalytic Processes in Materials Science

Publication Details

Published in: Physical Review

Volume 128, Issue 6, pp. 2661-2671

DOI: 10.1103/physrev.128.2661

Field-Weighted Citation Impact: 3.70

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