Department of Applied Physics, Hanyang University, Ansan, Kyunggi-Do 426-791, South Korea.
J Chem Phys. 2012 Sep 7;137(9):094310. doi: 10.1063/1.4748960.
The influence of the nonthermal shielding on the formation of the negative hydrogen ion (H(-)) by the polarization electron capture are investigated in partially ionized generalized Lorentzian plasmas. The Bohr-Lindhard method has been applied to obtain the negative hydrogen formation radius and cross section as functions of the collision energy, de Broglie wave length, Debye length, impact parameter, and spectral index of the plasma. The result shows that the nonthermal character of the plasma enhances the formation radius of the negative hydrogen, especially, for small Debye radii. It is found that the nonthermal effect increases the formation cross section of the negative hydrogen. It is also found that the maximum position of the formation cross section approaches to the collision center with an increase of the spectral index. In addition, it is found that the formation cross section significantly decreases with an increase of the Debye length, especially, for small spectral indices.
研究了部分电离广义洛伦兹等离子体中极化电子俘获形成负氢离子（H(-)）时非热屏蔽的影响。应用玻尔-朗德哈德方法获得了负氢形成半径和截面作为碰撞能量、德布罗意波长、德拜长度、碰撞参数和等离子体谱指数的函数。结果表明，等离子体的非热特性增强了负氢的形成半径，特别是对于小的德拜半径。发现非热效应增加了负氢的形成截面。还发现，随着谱指数的增加，形成截面的最大值接近碰撞中心。此外，还发现形成截面随着德拜长度的增加而显著减小，特别是对于小的谱指数。
