Gericke D O, Schlanges M, Bornath Th
Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545.
Phys Rev E Stat Nonlin Soft Matter Phys. 2002 Mar;65(3 Pt 2B):036406. doi: 10.1103/PhysRevE.65.036406. Epub 2002 Feb 15.
The stopping power of strongly coupled, partially ionized plasmas is investigated for charged beam particles with arbitrary velocities. Our approach is based on kinetic equations of the Boltzmann type that are suitably generalized to describe three-particle collisions. In this way, we consider elastic collisions between the beam and free plasma particles as well as the ionization and excitation of composite plasma particles by beam particle impact. Explicit expressions for both contributions are given in terms of the momentum transfer cross section that has been generalized for three-particle collisions. For fast beam particles, we obtain a generalized Bethe formula that includes correction terms due to the nonideality of the target plasma. Results are shown for hydrogen, carbon, and argon plasmas. Considerable modifications compared to the ideal behavior arise for strongly coupled plasmas. In particular, we are able to describe the Mott transition in the stopping power of dense, partially ionized plasmas.
研究了强耦合、部分电离等离子体对任意速度带电束粒子的阻止本领。我们的方法基于玻尔兹曼型动力学方程，该方程经过适当推广以描述三粒子碰撞。通过这种方式，我们考虑了束流与自由等离子体粒子之间的弹性碰撞以及束流粒子碰撞对复合等离子体粒子的电离和激发。这两种贡献的显式表达式是根据已针对三粒子碰撞进行推广的动量转移截面给出的。对于快速束流粒子，我们得到了一个广义的贝特公式，其中包含了由于靶等离子体非理想性导致的修正项。给出了氢、碳和氩等离子体的结果。与理想行为相比，强耦合等离子体出现了相当大的修正。特别是，我们能够描述致密、部分电离等离子体阻止本领中的莫特转变。
