Journal ArticleDOI
Drift Velocities of Slow Electrons in Helium, Neon, Argon, Hydrogen, and Nitrogen
J. L. Pack,A. V. Phelps +1 more
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In this paper, the drift velocities of electrons in helium, neon, argon, hydrogen, and nitrogen have been measured for values between 10 volt/cm-mm Hg at temperatures between 77.5 and 373 K.Abstract:
The drift velocities of electrons in helium, neon, argon, hydrogen, and nitrogen have been measured for $\frac{E}{p}$ values between ${10}^{\ensuremath{-}4}$ and 10 volt/cm-mm Hg at temperatures between 77\ifmmode^\circ\else\textdegree\fi{}K and 373\ifmmode^\circ\else\textdegree\fi{}K. The data were obtained from measurements of electron transit time in an improved version of the double-shutter tube developed by Bradbury and Nielsen. By applying sufficiently small voltage pulses to the control grids, it was possible to eliminate end effects present in previous experiments. Values of the momentum transfer cross sections for electrons with energies between about 0.003 and 0.05 ev are obtained which are consistent with the measured drift velocities for thermal electrons in helium, argon, hydrogen, and nitrogen. The derived momentum transfer cross section for electrons in helium is found to be independent of electron energy and equal to 5.3\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}16}$ ${\mathrm{cm}}^{2}$. The momentum transfer cross sections for argon, hydrogen, and nitrogen vary with electron energy.read more
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Journal ArticleDOI
Momentum transfer cross sections for slow electrons in he, ar, kr, and xe from transport coefficients,
L. S. Frost,A. V. Phelps +1 more
TL;DR: In this article, a comparison of theoretical and experimental values of the drift velocities and of the ratio of the diffusion coefficient to the mobility coefficient for electrons in these gases is obtained by calculating accurate electron-energy distribution functions for energies below excitation.
Journal ArticleDOI
Rotational Excitation and Momentum Transfer Cross Sections for Electrons in H 2 and N 2 from Transport Coefficients
L. S. Frost,A. V. Phelps +1 more
TL;DR: In this paper, rotational excitation and momentum transfer cross sections for low-energy electrons in hydrogen and nitrogen are obtained from a comparison of theoretical and experimental values for the mobility and the diffusion coefficient.
Journal ArticleDOI
The equatorial electrojet
TL;DR: An integrated treatment of observations and models of the undisturbed equatorial electrojet is presented in this article, where accomplishments during the past 15 years involving all aspects of the phenomenon are covered and, where possible, interrelated.
Journal ArticleDOI
Measurements of the Attachment of Low-Energy Electrons to Oxygen Molecules
Journal ArticleDOI
Equatorial electrojet—I. Development of a model including winds and instabilities
TL;DR: In this paper, physical features of the equatorial electrojet were examined with the aid of a numerical model which includes neutral-air winds and the two-stream instability, and it was found that the model currents and resultant magnetic variations are relatively unaffected by assuming the parallel conductivity, σ 0, to be infinite.
References
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Journal ArticleDOI
Absolute Values of the Electron Mobility in Hydrogen
TL;DR: In this article, an electrical shutter method is employed in which the shutters take the form of two fine wire grids, alternate wires of which are connected to a high frequency alternating potential, and only electrons which cross the gas space in one half-cycle are received at the collecting electrode.
Journal ArticleDOI
Conduction and Dispersion of Ionized Gases at High Frequencies
TL;DR: In this paper, the distribution in energy of electrons in a high frequency electromagnetic field is derived by kinetic theory methods by using the distribution law, the current density and hence the complex conductivity are calculated as functions of electron density, pressure, and frequency of the field.
Journal ArticleDOI
Absolute Values of the Electron Drift Velocity in Nitrogen, Helium, Neon and Argon
TL;DR: In this paper, the experimental values of the electron drift velocity are compared with those computed by theoretical equations and a discrepancy is shown to exist, in every case the deviation of the experimental from the calculated curves is explained by the hypothesis that the distribution of electron velocities is such that occasional inelastic collisions occur.
Journal ArticleDOI
Electron Collision Frequencies in Nitrogen and in the Lower Ionosphere
A. V. Phelps,J. L. Pack +1 more
Journal ArticleDOI
Drift Velocity of Electrons in Helium
TL;DR: In this paper, the drift velocity of electrons in helium has been measured for values between 4 and 40 volt/cm-mm Hg and the cross section for momentum transfer is independent of electron energy.
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