论文标题
在快速沉重离子与水分子碰撞中差分电子发射的经典蒙特卡洛计算
Classical-trajectory Monte Carlo calculations of differential electron emission in fast heavy-ion collisions with water molecules
论文作者
论文摘要
提出了对水分子的高电荷高速离子（$ \ sim $ 10 a.u.）的电子发射差电离横截面的经典描述。我们研究了电离的经典统计力学描述（$ \ hbar = 0 $量子力学极限）在不同的电子发射能和实体角度的有效性，其中预计将有诸如软和二进制碰撞之类的机制。使用经典的蒙特卡洛方法来计算C $^{6+} $，O $^{8+} $和SI $^{13+} $ praceiles的双重和单一的差分横截面，并与连续的波动eikonal Wave Wave Wave Wave Wave Wave Wave Wave Wave Wave Wave Wave Wave Wave Wave Wave tate Intial Intiquestional Intority结果进行比较。我们本着平均场理论的精神在模型中实现了时间依赖的筛选效果，以研究其对高电荷弹丸的影响。我们还通过三点潜力来表明其对差异横截面的影响，将精确描述对分子靶标的准确描述的作用。与实验非常吻合，在中等至高电子发射能。
A classical description of electron emission differential ionization cross sections for highly-charged high-velocity ions ($\sim$ 10 a.u.) impinging on water molecules is presented. We investigate the validity of the classical statistical mechanics description of ionization ($\hbar=0$ limit of quantum mechanics) in different ranges of electron emission energy and solid angle, where mechanisms such as soft and binary collisions are expected to contribute. The classical-trajectory Monte Carlo method is employed to calculate doubly and singly differential cross sections for C$^{6+}$, O$^{8+}$ and Si$^{13+}$ projectiles, and comparisons with Continuum Distorted Wave Eikonal Initial State theoretical results and with experimental data are presented. We implement a time-dependent screening effect in our model, in the spirit of mean-field theory to investigate its effect for highly charged projectiles. We also focus on the role of an accurate description of the molecular target by means of a three-center potential to show its effect on differential cross sections. Very good agreement with experiments is found at medium to high electron emission energies.
