Debye等离子体中高能H^++H碰撞激发过程的研究  

Research on proton-impact excitation process of hydrogen atom in Debye plasma

作　　者：孙天淼 祁月盈[1] 叶丹丹[1] 宁丽娜[1] 

机构地区：[1]嘉兴学院,嘉兴314001

出　　处：《物理学报》2013年第22期143-148,共6页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2013CB922200);国家自然科学基金(批准号:11005049;11025417;10979007);嘉兴学院重点项目(批准号:851712087;85151104)资助的课题~~

摘　　要：利用碰撞参数玻恩近似方法研究了Debye等离子体环境中高能H++H的碰撞激发过程,研究了不同Debye半径下氢原子1s→2p的激发耦合相互作用矩阵元、入射粒子能量为160 keV/u的激发电子跃迁概率以及入射粒子能量范围为100—1000 keV/u的碰撞激发截面.结果表明:随着屏蔽效应的增强,激发截面减小.根据激发截面的公式以及计算结果详细分析了引起激发截面减少的原因.入射粒子与激发电子之间的屏蔽相互作用势和靶的电子结构(波函数和能级)对激发截面都有很重要的影响.The high-energy H^＋＋H impact excitation process in Debye plasma is investigated using impact parameter Born approximation method. In the cases of several different values of Debye length D, the inter-nuclear distance R of matrix elements, the weighted probability at a collision energy of 160 keV/u, and impact excitation cross sections in an energy range of 100-1000 keV/u for direct 1s→2p transition in H for both the unscreened and screened Coulomb interactions are calculated. It is demonstrated that the magnitude of impact excitation cross section gradually reduces as screening parameter increases. According to the excitation cross section formula and the calculated results, a detailed analysis of the reason for the reduction caused by excitation cross section is given in this paper. The effects of screened Coulomb interaction on the potential of between incident particles and excited electronic and on the hydrogen-atomic structure （wave function and energy level） have very important influence on the excitation cross section.

关 键 词：等离子体 碰撞参数玻恩近似方法 碰撞激发截面 

分 类 号：O53[理学—等离子体物理] O571.6[理学—物理]