基于多体经典轨迹蒙特卡罗方法的H^(+),Li^(3+),Be^(4+),O^(7+)与He原子电荷交换过程  

Charge transfer in collisions of H^(+),Li^(3+),Be^(4+) and O^(7+) ions with He atom based on 4-classical trajectory Monte Carlo method

作　　者：李国壮 张晟[2,4] 焦志宏 李新霞[1] Li Guo-Zhuang;Zhang Sheng;Jiao Zhi-Hong;Li Xin-Xia(School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;Institute of Modern Physics,Chinese Academy of Science,Lanzhou 730000,China;College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730030,China;Advanced Energy Science and Technology Guangdong Laboratory,Huizhou 516003,China)

机构地区：[1]南华大学核科学技术学院,衡阳421001 [2]中国科学院近代物理研究所,兰州730000 [3]西北师范大学物理与电子工程学院,兰州730030 [4]先进能源科学与技术广东省实验室,惠州516003

出　　处：《物理学报》2022年第3期199-206,共8页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11775108)资助的课题。

摘　　要：经典轨迹蒙特卡罗(CTMC)方法是研究离子-原子碰撞系统电荷交换过程的常用方法,广泛应用于天体物理以及实验室等离子体环境下重粒子碰撞过程的研究.本文利用四体碰撞模型(4-CTMC)研究了包括两个束缚电子的四体碰撞过程,通过数值求解四体碰撞系统的哈密顿运动方程,计算了高电荷态入射离子(Li^(3+),Be^(4+)和O^(7+))同氦原子在大能量范围的单、双电子电离和俘获截面.H^(+)+He碰撞截面的计算中,在50—200 keV/amu的入射能区,4-CTMC的结果几乎重复了实验结果.在高电荷态入射情形下,4-CTMC计算的单电子电离和俘获截面值相较于三体碰撞模型(3-CTMC)在100—500 keV/amu的入射能区内与实验符合更好.尽管4-CTMC和3-CTMC忽略了电子关联,均高估了双电子电离和俘获截面(与实验值相比),但4-CTMC的结果更接近实验.The classical trajectory Monte Carlo(CTMC)method is a common method to study the charge-transfer and impact-ionization cross sections for the collisions between ions and atoms,and the heavy particle collision in astrophysics and laboratory plasma environment.Here in this work,we use the 4-CTMC method to study a four-body collision process including two bound electrons,and the Hamiltonian equation of the four-body dynamic system is solved numerically.The single/double electron ionization and capture cross sections are calculated for collisions of high charge state ions(Li^(3+),Be^(4+)and O^(7+))with helium atom in a wide range of projectile energy.The calculation results show that the results from the 4-CTMC method and the experimental measurements are in better agreement in a projectile energy range of 50-200 keV/amu for proton-helium collision system.In addition,for incident ions with high charge state,the results calculated by the 4-CTMC method are in better agreement with the experimental measurements or other theoretical values in a projectile energy range of 100-500 keV/amu.Though the double ionization and capture cross sections calculated by 4-CTMC or 3-CTMC method are higher than the experimental results due to ignoring the electron correlation,the results from the 4-CTMC method are in better agreement with the experimental results.

关 键 词：高电荷态入射离子 4-CTMC 电荷交换过程 

分 类 号：O562[理学—原子与分子物理]