The ratio of lateral diffusion coefficient to mobility for electrons in hydrogen and nitrogen at moderate E/N

Abstract

With the help of the Townsend and Huxley technique the measurement of the ratio of lateral diffusion coefficient to mobility D / p in hydrogen and nitrogen at ambient temperature has been carried out for reduced electric fields 34.7< E/N < 462.7 Td and 2.5 C E/N 6404.6 Td respectively.

The transport of electrons through nitrogen gas

“…This error is considered small due to the accuracy of available data and the relative insensitivity to DL. The present results agree well with those of Roznerski and Leja (1980) up to 400 Td. The results of Fletcher and Reid (1980) and Kontoleon et af (1973) diverge from the present results for €IN 3 250 Td and it is clear that a large discrepancy arises for E / N > 400 Td .…”

Integral cross sections for electron impact excitation of electronic states of N2

“…The argument here is, however, clouded by the fact that the two available measurements for D T µ by Wedding et al and Roznerski are in quite poor agreement, the results of Wedding et al being systematically higher in magnitude than those of Roznerski. In addition, an earlier measurement for D T µ by Roznerski and Leja [40] was in good accord with that from Wedding et al, although Roznerski's [23] later measurements clearly supersede the earlier study. Finally, in figure 8, we consider the result of our Monte Carlo analysis for the behaviour of D L µ as a function of E N .…”

Rf breakdown of low-pressure gas and a novel method for determination of electron-drift velocities in gases

“…Figures 1 and 5, respectively, compare the breakdown curves calculated from the criterion (4) with measured breakdown curves of the rf and longitudinally combined discharges. In calculations we have used the values of V e , D L and D e given in [48][49][50][51][52][59][60][61][62][63][64][65][66] and, to obtain the ionization rate ν i = αV e , we have taken values of the first Townsend coefficient from [42,62,[65][66][67]. Figures 1 and 5 show that there is satisfactory agreement between the curves calculated from equation (4) and the measured ones in the region near and to the righthand side of minima of breakdown curves, the calculated curves being located in regions of higher gas pressures than are the measured ones.…”

“…Figures 1 and 5, respectively, compare the breakdown curves calculated from the criterion (4) with measured breakdown curves of the rf and longitudinally combined discharges. In calculations we have used the values of V e , D L and D e given in [48][49][50][51][52][59][60][61][62][63][64][65][66] and, to obtain the ionization rate ν i = αV e , we have taken values of the first Townsend coefficient from [42,62,[65][66][67].…”