The measurement of the ratio of diffusion coefficient to mobility for electrons at low E/p

Virr, L E; Lucas, J.; Kontoleon, N.

doi:10.1088/0022-3727/5/3/314

Cited by 19 publications

(3 citation statements)

References 17 publications

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“…Commercial-grade gases were used and the carbon monoxide and carbon dioxide had purities of 99.9% and 99.97% respectively. The experimental procedure of Virr et al (1972) is used to obtain the radial distribution of anode current J(d, r)/J (d, b) and the current amplification J(d, b)/Je (O, b) where d is the gap separation, J(d, r ) the current collected by an t N K is now at 199, Ippocratous Road, Athens 708, Greece.…”

Section: Experimental Apparatus and Measurementsmentioning

confidence: 99%

Diffusion and ionization studies for electron swarms in carbon monoxide and carbon dioxide

Lakshminarasimha

Lucas

Kontoleon

1974

J. Phys. D: Appl. Phys.

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The ratio of the radial diffusion coefficient to mobility Dr/μ has been measured for electron swarms moving through uniform electric fields in carbon monoxide and carbon dioxide for the range 3 less-than-or-eq, slant E/p less-than-or-eq, slant 500 and 10 less-than-or-eq, slant E/p less-than-or-eq, slant 550 V cm−1 Torr−1 at 0 °C respectively using the analytical methods described by Kontoleon et al (1972). The values of Dr/μ in the range E/p>50 are the first results in both the gases. The ionization coefficient α/p has been calculated from the current-growth experiments in carbon monoxide and carbon dioxide in the range 50 less-than-or-eq, slant E/p less-than-or-eq, slant 500, and the values of α in CO, in the range E/p>90, have been measured for the first time.The present experimental data obtained for carbon dioxide is used to calculate the electron energy distribution and the mean energy using the techniques described by Lucas (1969).

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Section: Experimental Apparatus and Measurementsmentioning

confidence: 99%

Diffusion and ionization studies for electron swarms in carbon monoxide and carbon dioxide

Lakshminarasimha

Lucas

Kontoleon

1974

J. Phys. D: Appl. Phys.

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“…Collisions of electrons with nitrogen molecules are of significance in a number of areas such as atmosphere, ionosphere and plasma physics as well as gaseous discharge processes and also because of their cognitive role in molecular physics [18,19]. Different experimental techniques are necessary because of the apparent limitations of all applied methods and the possibility of discovering new areas of investigation on a higher accuracy level [1,[20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Transport parameters of electron swarms in nitrogen at moderate and elevated E/N

Roznerski

1996

J. Phys. D: Appl. Phys.

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“…Measurements of the transverse characteristic energy by Petrović and Crompton were made by the Townsend-Huxley method using the apparatus with the fixed distance between the electrodes, and by the apparatus whose cathode-anode separation and anode configuration can be varied [74]. The experimental setup initially developed by Virr et al [103] was used by Saelee and Lucas [76] and by Lakshminarasimha et al [104] to measure the drift velocity and transverse characteristic energy.…”

Section: Previous Measurementsmentioning

confidence: 99%

Scanning drift tube measurements and kinetic studies of electron transport in CO

Dujko

Bošnjaković

Vass

et al. 2023

Plasma Sources Sci. Technol.

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We present scanning drift tube measurements of electron swarm transport coefficients in CO as a function of the reduced electric field E/N at room temperature under time-of-flight (TOF) conditions. The measurements are compared to modeling results and other available experimental data on swarm transport over the broad range of E/N from 2 Td to 1603 Td. The modeling results are obtained in Monte Carlo simulations and by solving the electron Boltzmann equation using a multi-term approach and the density gradient expansion procedure. We find generally good agreement between the measured and calculated transport coefficients. We propose a strategy to improve the cross-section set used to explain certain discrepancies at lower E/N values. Measurements and calculations of electron transport coefficients under hydrodynamic conditions are complemented by Monte Carlo simulations of electron transport in an idealized steady-state Townsend (SST) setup. The ionization coefficient is calculated as a function of E/N from the spatial density profiles of the electrons and compared to the corresponding values evaluated from the knowledge of the effective ionization frequency, drift velocity and longitudinal diffusion coefficient. Contrary to the traditional views, according to which the spatial relaxation of the mean energy and other transport properties for electrons in molecular gases is most commonly monotonic or quasi-monotonic, we find a `window' of E/N where the SST transport properties of the electrons exhibit oscillatory behavior as they relax towards the equilibrium state far downstream from the electron emitting boundary.

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The measurement of the ratio of diffusion coefficient to mobility for electrons at low E/p

Cited by 19 publications

References 17 publications

Diffusion and ionization studies for electron swarms in carbon monoxide and carbon dioxide

Diffusion and ionization studies for electron swarms in carbon monoxide and carbon dioxide

Transport parameters of electron swarms in nitrogen at moderate and elevated E/N

Scanning drift tube measurements and kinetic studies of electron transport in CO

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