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Pulsed laser ablation of binary compounds: effect of time delay in component evaporation on ablation plume expansion
Journal of Physics D: Applied Physics ( IF 3.4 ) Pub Date : 2021-02-14 , DOI: 10.1088/1361-6463/abdb6c
A A Morozov 1 , S V Starinskiy 1, 2 , A V Bulgakov 1, 3
Affiliation  

Pulsed laser ablation of compound materials often occurs with delayed evaporation of a less volatile component; however, the effect of the delay on ablation plume expansion remains virtually unexplored. Here, we have performed an experimental and theoretical study of the delayed evaporation effect using an example of a plume produced by nanosecond laser ablation of a gold–silver alloy in a vacuum and comparing it with ablation of pure gold and silver targets. The plume expansion dynamics are investigated by time-of-flight (TOF) mass spectrometry and direct simulation Monte Carlo (DSMC), while the laser-induced target evaporation is analyzed using a thermal model. A dramatic effect of the delay time on the average kinetic energy of the plume particles, especially for the less volatile gold, is demonstrated and the main collisional processes governing the two-component plume expansion under the conditions of delayed evaporation are revealed. Based on comparison of experimental and DSMC data, the delay of the gold evaporation onset is estimated as approximately 0.6 ns. The delayed evaporation is therefore an important factor for correct interpretation of TOF measurements in ablation plumes with components of different volatilities.



中文翻译:

二元化合物的脉冲激光烧蚀:组分蒸发中的时间延迟对烧蚀羽流膨胀的影响

化合物材料的脉冲激光烧蚀通常发生在挥发性较低的组分延迟蒸发之后。然而,延迟对消融羽流膨胀的影响实际上尚未被探索。在这里,我们以延迟进行的蒸发效应的实验和理论研究为例,以在真空中对金-银合金进行纳秒激光烧蚀产生的羽流为例,并将其与纯金和银靶的烧蚀进行了比较。通过飞行时间(TOF)质谱和直接模拟蒙特卡洛(DSMC)研究了羽流膨胀动力学,同时使用热模型分析了激光诱导的目标蒸发。延迟时间对烟羽颗粒的平均动能产生了巨大影响,尤其是对于挥发性较低的金,证明了这一点,揭示了在延迟蒸发条件下控制两组分羽流膨胀的主要碰撞过程。根据实验数据和DSMC数据的比较,金蒸发开始的延迟估计约为0.6 ns。因此,延迟蒸发是正确解释具有不同挥发性成分的消融羽流中TOF测量值的重要因素。

更新日期:2021-02-14
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