Ion mobilities in Xe/Ne and other rare-gas mixtures.
Ion mobilities in Xe/Ne and other rare-gas mixtures.
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Xe/Ne 和其他稀有气体混合物中的离子迁移率。
DOI：
10.1103/physreve.68.046408
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
L. Pitchford
中科院分区：
文献类型：
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作者：
D. Piscitelli;A. Phelps;J. de Urquijo;E. Basurto;L. Pitchford
对于模拟稀有气体混合物中辉光放电很重要的离子迁移率或漂移速度数据通常是不可用的，也没有计算这些数据所需的离子中性散射截面。在本文中，我们提出了一组Xe+和Ne+与Xe和Ne原子碰撞的截面。使用蒙特卡罗模拟中设置的横截面计算300 K时的离子迁移率，在纯气体和含有5%和20% Xe/Ne的Xe/Ne混合物中，电场强度降低，E/N高达1500 x 10(-21) V m(2)，这是等离子体显示面板（pdp）感兴趣的混合物。计算出的Xe+迁移率很大程度上取决于混合物的组成，但在本文研究的范围内，随着混合物中Xe的增加，Ne+迁移率只有轻微的变化。纯气体的流动率与现有的实验值相吻合，低E/N下气体混合物的流动率与我们最近的测量结果相吻合，这些测量结果将单独发表。这些离子迁移率的计算结果被用来评估布兰克定律和梅森和哈恩[物理学家]提出的混合规则的预测。Rev. A 5,438(1972)]通过了解每种纯气体的迁移率来确定混合物中离子的迁移率。Mason和Hahn的混合规则在高场强下精确到10%以上，在广泛的pdp建模条件下。我们的结论是，结合已知的母气体迁移率值和其他气体中稀有气体离子迁移率的朗之万形式，可以很好地估计Xe/Ne和其他二元稀有气体混合物中离子在高E/N时的迁移率。这一结论也得到了Ar/Ne混合物的结果的支持。
The ion mobility or drift velocity data important for modeling glow discharges in rare gas mixtures are not generally available, nor are the ion-neutral scattering cross sections needed to calculate these data. In this paper we propose a set of cross sections for Xe+ and Ne+ collisions with Xe and Ne atoms. Ion mobilities at 300 K calculated using this cross section set in a Monte Carlo simulation are reported for reduced field strengths, E/N, up to 1500 x 10(-21) V m(2), in pure gases and in Xe/Ne mixtures containing 5% and 20% Xe/Ne, which are mixtures of interest for plasma display panels (PDPs). The calculated Xe+ mobilities depend strongly on the mixture composition, but the Ne+ mobility varies only slightly with increasing Xe in the mixture over the range studied here. The mobilities in pure gases compare well with available experimental values, and mobilities in gas mixtures at low E/N compare well with our recent measurements which will be published separately. Results from these calculations of ion mobilities are used to evaluate the predictions of Blanc's law and of the mixture rule proposed by Mason and Hahn [Phys. Rev. A 5, 438 (1972)] for determining the ion mobilities in mixtures from a knowledge of the mobilities in each of the pure gases. The mixture rule of Mason and Hahn is accurate to better than 10% at high field strengths over a wide range of conditions of interest for modeling PDPs. We conclude that a good estimate of ion mobilities at high E/N in Xe/Ne and other binary rare gas mixtures can be obtained using this mixture rule combined with known values of mobilities in parent gases and with the Langevin form for mobility of rare gas ions ion in other gases. This conclusion is supported by results in Ar/Ne mixtures which are also presented here.