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采用蒙特-卡罗(Monte Carlo)方法,模拟了激光烧蚀粒子输运动力学过程,在环境气体压强为100 Pa的情况下,研究了环境气体种类(He,Ne,Ar和假想气体等)对烧蚀粒子速度劈裂的影响.研究结果表明,在四种环境气体中传输的烧蚀粒子均出现了速度劈裂现象,形成速度劈裂所需时间按He,Ne,假想气体和Ar的次序减小.还研究了环境气体分子的质量和半径对烧蚀粒子速度劈裂的影响,形成速度劈裂所需时间随环境气体分子半径(或质量)增大而减小.在假想气体中,两速度峰强度相等时的强度最小.结合欠阻尼振荡模型和惯性流体模型,对劈裂的形成时间进行了解释.所得结论可为进一步定量研究纳米晶粒生长机理提供基础.
Monte Carlo method was used to simulate the particle transport kinetics of laser ablation. At the ambient pressure of 100 Pa, the pairs of ambient gas species (He, Ne, Ar and imaginary gas) were studied The results show that the ablation particles propagating in the four kinds of ambient gases all appear the velocity splitting phenomenon, and the time required for forming the velocity splitting is in the order of He, Ne, hypothetical gas and Ar And the influence of the mass and radius of environmental gas molecules on the splitting of ablation particle velocity is also studied.The time required for the formation of velocity splitting decreases with the increase of the molecular radius (or mass) of the ambient gas.In the hypothetical gas, The intensity of the two velocity peaks with the same intensity is the least, and the formation time of the splitting is explained by the combination of the underdamped oscillatory model and the inertial fluid model.The conclusion can provide the basis for further quantitative study of the growth mechanism of nanocrystals.