Numerical simulation of the Zeeman effect in neutral xenon from NIR diode-laser spectroscopy
Numerical simulation of the Zeeman effect in neutral xenon from NIR diode-laser spectroscopy
复制标题
近红外二极管激光光谱中性氙塞曼效应的数值模拟
DOI：
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发表时间：
2008
期刊：
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通讯作者：
A. Gallimore
中科院分区：
文献类型：
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作者：
Bailo B. Ngom;T. B. Smith;Wensheng Huang;A. Gallimore
本文提出了一种数值方法，用于模拟电流变管等离子体中834.682 nm波长的塞曼分裂6S′[1/2]→6P′[1/2]线的半导体激光光谱中的中性氙吸收谱。为了模拟光谱，我们将Voigt轮廓应用于分别从反常塞曼和非线性塞曼超精细结构理论计算的偶数和奇数同位素的σ-跃迁线的光谱。模拟的光谱与在30 ~ 300 G范围内测得的塞曼分裂光谱吻合得很好。一个商业非线性最小二乘求解器（LSQNONLIN）返回场强和平移等离子体动力学温度，最大限度地减少模拟和实验光谱之间的误差。本文的工作是利用二极管激光诱导荧光计算霍尔推力器羽流中的磁场拓扑和中性氙粒子速度分布的一个前奏。
We present a numerical method for simulating neutral xenon absorption spectra from diode-laser spectroscopy of the Zeeman-split 6S′[1/2]→6P′[1/2] line at 834.682 nm-air in a galvatron’s plasma. To simulate the spectrum, we apply a Voigt profile to a spectrum of σ-transition lines of even- and odd-numbered isotopes computed from anomalous Zeeman and nonlinear Zeeman hyperfine structure theories, respectively. Simulated spectra agree well with Zeeman-split spectra measured from 30 to 300 G. A commercial nonlinear least-squares solver (LSQNONLIN) returns field strengths and translational plasma kinetic temperatures that minimize the error between simulated and experimental spectra. This work is a preamble to computing magnetic field topology and the speed distribution of neutral xenon particles in the plume of a Hall thruster from diode laser-induced fluorescence.