各向同性碰撞可能产生净圆偏振而不仅仅是谱线的去偏振
Possible creation of net circular polarization and not only depolarization of spectral lines by isotropic collisions
摘要：
我们将表明，各向同性碰撞的电子和质子与中性氢可以导致创建的净取向的原子水平在存在的磁场。因此，发射的谱线的斯托克斯-V轮廓与塞曼效应的典型反对称特征相比几乎是对称的。此外，对称波瓣的幅度可以显着高于反对称分量的幅度。这种机制是由不同塞曼子能级之间的碰撞跃迁的$\pm{M}$对称性破缺引起的。我们将展示一个H $α$线的第一个结果的例子。这种新机制或许可以解释一些太阳临边观测中观察到的谱线的净圆偏振，而这些谱线目前尚不清楚。然而，我们的结果是非常初步的，需要更多的发展才能进一步。
英文摘要：
We will show that isotropic collisions of electrons and protons with neutral hydrogen can lead to creation of net orientation of the atomic levels in the presence of a magnetic field. Consequently, the emitted Stokes-V profile of the spectral lines can be almost symmetric in contrast to the typical antisymmetric signature of the Zeeman effect. Moreover, the amplitude of the symmetric lobe can be significantly higher than the amplitude of the antisymmetric components. This mechanism is caused by a $\pm{M}$ symmetry breaking of the collisional transitions between different Zeeman sublevels. We will show an example of our first results for the H$α$ line. This new mechanism could perhaps explain the net circular polarization of spectral lines observed in some solar limb observations and which are currently not understood. However, our results are very preliminary and more developments are needed for going further on.
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