质子碰撞硼原子非辐射的电荷转移过程  

Non-radiative charge transfer process of proton impcating B atom

作　　者：朱宇豪 袁翔 吴勇[2] 王建国[2] Zhu Yu-Hao;Yuan Xiang;Wu Yong;Wang Jian-Guo(School of Science,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Laboratory of Computational Physics,Institute of Applied Physics and Computational Mathematics,Beijing 100084,China)

机构地区：[1]西安建筑科技大学理学院,西安710055 [2]北京应用物理与计算数学研究所,计算物理重点实验室,北京100084

出　　处：《物理学报》2023年第16期86-93,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11934004)资助的课题.

摘　　要：重粒子碰撞中的电子转移涉及复杂的电子关联机制,极大地影响等离子体中电荷态平衡,也是X射线的辐射的重要来源之一.电子转移截面与速率系数是国防工业发展核聚变等离子体所需要的重要原子参数.基于全量子的非辐射分子轨道密耦合方法,系统研究了质子碰撞硼原子在10^(-3)-10^(3)eV/u能量区间内的硼原子电子转移过程.计算采用多参考组态方法得到总共15个电子转移、激发以及弹性散射的通道,每个通道对应的分子态能量得到了与实验符合较好的结果.分子态的绝热势能曲线间的避免交叉现象明显,构成了电子转移的主要途径.计算发现,质子碰撞硼原子过程中2s轨道的电子转移是占主导地位,2p轨道的电子转移贡献较小.在低能区,电子转移截面出现了明显的量子共振现象,这些共振主要来源于不同能量通道的耦合.此外,还计算了不同温度下的质子碰撞硼原子的电子转移速率,该速率可为复杂等离子体环境的模拟诊断提供重要的原子参数支持.Electron transfer in heavy particle collisions,involving complicated electron correlation mechanisms,greatly affects the charge state balance in plasma,and is also one of important sources for X-ray radiation.Electron transfer cross section and rate coefficient are important atomic parameters required for the development of nuclear fusion plasma in the national defense industry.We systematically investigate the electron transfer process of proton impacting boron atom in an energy range of 10^(-3)-10^(3)eV/u based on a fully quantum non-radiative molecular orbital close-coupling method.A total of 15 channels of electron transfer,excitation,and elastic scattering are obtained by using the multi-reference configuration interaction method,and the corresponding molecular energy of each channel is in good agreement with the experimental results.The phenomenon of avoiding crossing between the adiabatic potential energy curves of molecular states is obvious,which constituents the main pathway of electron transfer.The calculation shows that the electron transfer of the 2s orbital is dominated in the process of proton impacting boron atom,while the electron transfer of the 2p orbital contributes a little.In the low energy region,there are obvious quantum resonances in the electron transfer cross section,which originate from the coupling between high energy channel and low energy channel.In addition,we calculate the electron transfer rates of proton-impact boron atom at different temperatures,which can provide important atomic parameter which support for simulating and diagnosing complex plasma environments.

关 键 词：电子转移 重粒子碰撞 势能曲线 

分 类 号：O571.6[理学—粒子物理与原子核物理]