The LisbOn KInetics Monte Carlo solver

The LisbOn KInetics Monte Carlo (LoKI-MC) is an open-source simulation tool that solves the electron kinetics for low-temperature plasmas excited by uniform DC electric fields from different gas mixtures, using Monte Carlo techniques. Following the strategy and data organization of the LisbOn KInetics Boltzmann (LoKI-B) solver, the program easily addresses any complex mixture of atomic/molecular species, describing electron collisions with any target state (electronic, vibrational and rotational), characterized by any user-prescribed population. LoKI-MC is written in C++, benefiting from a highly-efficient object-oriented structure. On input, the code requires the working conditions, the gas-mixture composition, the distributions of populations for the levels of the atomic/molecular gases considered, and the relevant sets of electron-scattering cross sections obtained from the open-access website LXCat. On output, it yields the electron energy and velocity distribution functions, the electron swarm parameters, the collision rate-coefficients, and the electron power absorbed from the electric field and transferred to the different collisional channels. This paper presents LoKI-MC and gives examples of results obtained for different model and real gases, verifying and benchmarking the simulation tool against analytical solutions and other available codes, and assesses its computational performance. Moreover, the effects of the gas temperature, anisotropic ionization scattering (induced by momentum conservation) and superelastic collisions are analyzed in real gases.

洛卡因动力学蒙特卡洛（LoKI-MC）是一款开源的模拟工具，它采用蒙特卡洛方法求解低温等离子体在均匀直流电场激发下电子动力学问题，适用于不同气体混合物。遵循洛卡因动力学玻尔兹曼（LoKI-B）求解器的策略和数据组织方式，该程序能够轻松处理任何复杂的原子/分子物种混合，并描述电子与任何目标状态的碰撞（包括电子态、振动态和旋转态），其碰撞特性可由用户自定义的粒子数密度来表征。LoKI-MC采用C++编写，并得益于高效的面向对象结构。在输入阶段，代码需要指定工作条件、气体混合物的组成、所考虑的原子/分子气体能级的粒子数分布，以及从开放获取网站LXCat获得的电子散射截面相关数据集。输出时，它提供电子能量和速度分布函数、电子群参数、碰撞速率系数以及从电场吸收并传递到不同碰撞通道的电子功率。本文介绍了LoKI-MC，并展示了对于不同模型气体和真实气体的模拟结果示例，通过分析与解析解以及其他可用代码的验证和基准测试，评估了该模拟工具的计算性能。此外，还分析了真实气体中气体温度、各向异性电离散射（由动量守恒引起）和超弹性碰撞的影响。