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

Abstract

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).

Electron Transport Coefficients in Carbon Monoxide and Deuterium

“…Values of DTII1 were measured by Warren and Parker (1962) in the low E/N range at 77 K. The room-temperature results of Skinker and White (1923) and Roznerski and Mechlinska-Drewko (1979) extend over the entire range of E/N covered by us in the present study, while the lower end of the E/N range investigated by Lakshminarasimha et al (1974) overlaps the upper range of our measurements. Nelson and Davis (1969) measured the diffusion coefficient for thermal electrons, while Wagner et al (1967) measured values of the longitudinal diffusion coefficient DL.…”

“…Lack of reliable transport data limited their determination of the cross sections to energies less than 1 eV. With the availability of new drift velocity (Vdr) data (Milloy 1977), Land (1978) was able to extend the analysis to include the resonance, basing his work on Milloy's data and also data for the transverse diffusion coefficient to mobility ratio Drill of Skipker and White (1923) and Lakshminarasimha et al (1974). A significant result of this work was his conclusion that, in order to obtain reasonable agreeme~ between calculated and measured transport coeffiCients, it was necessary to apply a scaling factor of 1·9 to the set of vibrational excitational cross sections determined by Ehrhardt et al (1968) from their beam experiment.…”

Investigation on the reduced critical breakdown field of hot CO2 gas and CO2-based mixtures

“…In this work, it is essential to validate the data with the experiment results [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28]. In fact, it should be noted that for now there are only available data for air at elevated temperatures.…”

A pulse technique for the measurement of the ratio of diffusion to mobility for electron swarms in gases at high E/N

“…After the electron pulsed source is shut off, a small current remains generated by both the secondary electron processes and the space-charge current of the positive ions. The current ratio is analysed by using a trial-and-error computer technique in (19) together with the CXT values of Lakshminarasimha et al (1974) 6 for E/N up to 5650 Td. The results for (Dr/p)exp by Lakshminarasimha et a1 (1974) are shown for comparison.…”