Electron swarm parameters in nitrogen

Abstract

Measurements have been made, using recently developed experimental and theoretical techniques, of: the ratio of radial diffusion coefficient to mobility, Dr/μexp; the amplification coefficient, (λL-uL)/p; and Townsend's ionization coefficient, αT/p: for electron swarms in nitrogen for 10 less-than-or-eq, slant E/p less-than-or-eq, slant 450 V cm−1 Torr−1 at 0 °C. The results have been used for the estimation of electron energy distribution and of the mean energy for 30 less-than-or-eq, slant E/p less-than-or-eq, slant 450. It has been shown that at high E/p the distribution becomes strongly anisotropic, the degree of anisotropy being described by a coefficient δ.

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

“…For E/N higher than 200 Td the results of this work, presented in figure 2, are in very good agreement with those by Fletcher and Reid [30] in the E/N overlap. The present results agree excellently with those of Kontoleon et al [44] for E/N 750 Td except for E/N = 500 Td. Above 750 Td the points from work [44] lie lower than ours but the points of Al-Amin et al [43] are situated higher.…”

“…The present results agree excellently with those of Kontoleon et al [44] for E/N 750 Td except for E/N = 500 Td. Above 750 Td the points from work [44] lie lower than ours but the points of Al-Amin et al [43] are situated higher. For 848 Td the difference related to the results of work [43] equals about 18%.…”

“…For 848 Td the difference related to the results of work [43] equals about 18%. A quantitative explanation of the differences between the experimental and theoretical results seems to be a complex problem on account of applying both the multiterm Legendre solution and a strong anisotropic scattering ( ), Wedding et al [45]; ( ), Kontoleon et al [44] (from graph); (⊕), Townsend and Bailey [36]; (♦), Naidu and Prasad [37]; ( ), Al-Amin et al [43]; (+), Novak and Frechette [50]; (•), Taniguchi et al [34]; and ( ), present results. of electrons by nitrogen molecules [19,43].…”

The ratio of lateral diffusion coefficient to mobility for electrons in hydrogen and nitrogen

“…The results for hydrogen are presented in figures 1 and 2. Below 100Td there is good agreement with the results of Blevin et al (1978a), obtained from current ratio measurements, and Kontoleon et al (1972). For E / N > 100 Td the present data points are a few per cent higher than those quoted above.…”

Electron Transport Coefficients in Carbon Monoxide and Deuterium

“…The disagreement between the scaling factors was attributed primarily to the inadequacy of the approximations in the transport code used in the earlier work. Land had attempted to compensate for errors introduced by these approximations by applying corrections that were based on the work of Kontoleon et al (1973). However, Haddad and Milloy showed that corrections became necessary at values of the reduced electric field strength E/N (N is the gas number density) where the transport coefficients were strongly influenced by scattering in the resonance region but where Land had assumed the corrections to be still negligible.…”