Analysis of ion mobility and diffusion in atmospheric gaseous mixtures from Monte Carlo simulation and macroscopic laws

被引:11
作者
Benhenni, M. [1 ]
Yousfi, M. [1 ]
Bekstein, A. [1 ]
Eichwald, O. [1 ]
Merbahi, N. [1 ]
机构
[1] Univ Toulouse 3, CPAT, CNRS, UMR 5002, F-31062 Toulouse 9, France
关键词
D O I
10.1088/0022-3727/39/22/022
中图分类号
O59 [应用物理学];
学科分类号
摘要
The reduced mobility and diffusion coefficients of N-2(+) and O- are calculated with a Monte Carlo simulation for the gas mixtures N-2-H2O (50%, 50%) and O-2-N-2 (80% N-2,20% O-2), respectively, from measured and calculated elastic and inelastic cross sections. These mobility and longitudinal diffusion coefficients have been compared with the standard Blanc's law and with the common mean energy (CME) procedure. Good agreement between these three calculation methods was found for the mobility and diffusion of N-2(+) in the N-2-H2O mixture at high reduced fields where inelastic processes are relatively uninfluential. However, a strong deviation between Blanc's law and both CME procedure and our Monte Carlo calculations for the reduced mobility and the diffusion coefficient of N-2(+) in this gas mixture N-2-H2O was observed at low reduced fields, because inelastic processes are significant. On the contrary, for the case of the N-2-O-2 mixture, where inelastic processes are small over the reduced electric field range 1 - 8000 Td, the three calculation methods led to similar results. The elastic collision cross sections used were determined from a semi-classical JWKB approximation by using a rigid core potential model for both symmetric N-2(+)/N-2 and asymmetric N-2(+)/H2O, O-/O-2 and O-/N-2 ion - neutral systems. Moreover, the inelastic cross sections were extended to low N-2(+) energies from appropriate approximations. These cross section sets were validated from the good agreement between our Monte Carlo calculated N-2(+) reduced mobilities in N-2 and H2O, O- in O-2 and N-2 and either measured values for the systems N-2(+)/N-2 and O-/O-2 or physical properties of the systems N-2(+)/H2O and O-/N-2.
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页码:4886 / 4893
页数:8
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