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Temporal description of aluminum laser-induced plasmas by means of a collisional-radiative model

机译：铝激光诱导等离子体通过碰撞模型的时间描述

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A 0D numerical approach including a Collisional-Radiative model is elaborated in the purpose of describing the behavior of the nascent plasma resulting from the interaction between a laser pulse (λ = 532 nm, τ = 4 ns and F = 6.5 J cm~(-2)) with an aluminum sample. The species considered are Al, Al~+, Al~(2+) and Al~(3+) on their different excited states and free electrons. Both groups of particles are characterized by their translation temperature in thermal non-equilibrium state. Besides, each population density is assumed to be in chemical non-equilibrium and behaves freely through the seven involved elementary processes (electron impact induced excitation and ionization, elastic collisions, multi-photon ionization, inverse laser Bremsstrahlung, direct electron Bremsstrahlung and spontaneous emission). Atoms passing from sample to gas phase are described by considering classical vaporization phenomena so that the surface temperature is limited to values less than the critical point. The relative role of the elementary processes is discussed and the time-evolution of the excitation of the species is analyzed.
机译：包括碰撞模型的0d数值方法以描述由激光脉冲之间的相互作用产生的新生等离子体的行为（λ= 532nm，τ= 4ns和f = 6.5jcm〜（ - 2））用铝样品。考虑的物种是Al，Al〜+，Al〜（2+）和Al〜（3+）在其不同的激发态和自由电子上。两组颗粒的特征在于它们在热非平衡状态下的翻译温度。此外，假设每个人口密度在化学非平衡中，并通过七个涉及的基本方法自由行为（电子碰撞诱导激发和电离，弹性碰撞，多光子电离，逆激光Bremsstrahlung，直接电子Bremsstrahlung和自发排放） 。通过考虑经典汽化现象，描述从样品到气相的原子通过，使得表面温度限制为小于临界点的值。讨论了基本方法的相对作用，分析了物种激发的时间越演变。

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