氢原子与MgH太阳谱线的退极化
Depolarization of MgH Solar Lines by Collisions with Hydrogen Atoms
摘要：
由于完全缺乏关于MgH和氢原子之间碰撞速率的任何信息，对MgH分子非常丰富的第二太阳光谱的解释面临着严重的问题。这项工作的目的是开始填充这个空白的过程中提供，第一次，量子激发，去极化，和极化转移碰撞率的MgH基态$X^2Σ$。为了实现这项工作的目标，势能面计算，然后包括在薛定谔方程，以获得碰撞的概率，因此，所有的碰撞率。我们的速率是在从$T \!\!=$ 2000 K到$T \!\!=$ 15,000 K的温度范围内获得的。采用先进的遗传编程方法，以适应所有的去极化率与有用的分析功能的两个变量：总分子角动量和温度。我们研究了太阳的影响，我们发现，$X^2Σ$状态的MgH是部分去极化的各向同性碰撞中性氢在其基态$^2S$。我们的研究结果表明，广泛使用的近似，其中忽略了较低级别的偏振的适用性的限制。
英文摘要：
Interpretations of the very rich second solar spectrum of the MgH molecule face serious problems owing to the complete lack of any information about rates of collisions between the MgH and hydrogen atoms. This work seeks to begin the process of filling this lacuna by providing, for the first time, quantum excitation, depolarization, and polarization transfer collisional rates of the MgH ground state $X^2Σ$. To achieve the goals of this work, potential energy surfaces are calculated and then are included in the Schrödinger equation to obtain the probabilities of collisions and, thus, all collisional rates. Our rates are obtained for temperatures ranging from $T \!\!=$2000 K to $T \!\!=$15,000 K. Sophisticated genetic programming methods are adopted in order to fit all depolarization rates with useful analytical functions of two variables: the total molecular angular momentum and temperatures. We study the solar implications of our results, and we find that the $X^2Σ$ state of MgH is partially depolarized by isotropic collisions with neutral hydrogen in its ground state $^2S$. Our findings show the limits of applicability of the widely used approximation in which the lower-level polarization is neglected.
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