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首页> 外文期刊>Physical Review X >Relation between Inner Structural Dynamics and Ion Dynamics of Laser-Heated Nanoparticles
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Relation between Inner Structural Dynamics and Ion Dynamics of Laser-Heated Nanoparticles

机译：激光加热纳米粒子内部结构动力学与离子动力学的关系

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When a nanoparticle is irradiated by an intense laser pulse, it turns into a nanoplasma, a transition that is accompanied by many interesting nonequilibrium dynamics. So far, most experiments on nanoplasmas use ion measurements, reflecting the outside dynamics in the nanoparticle. Recently, the direct observation of the ultrafast structural dynamics on the inside of the nanoparticle also became possible with the advent of x-ray free electron lasers (XFELs). Here, we report on combined measurements of structural dynamics and speeds of ions ejected from nanoplasmas produced by intense near-infrared laser irradiations, with the control of the initial plasma conditions accomplished by widely varying the laser intensity ( 9 × 10 14 W / cm 2 to 3 × 10 16 W / cm 2 ). The structural change of nanoplasmas is examined by time-resolved x-ray diffraction using an XFEL, while the kinetic energies of ejected ions are measured by an ion time-of-fight method under the same experimental conditions. We find that the timescale of crystalline disordering in nanoplasmas strongly depends on the laser intensity and scales with the inverse of the average speed of ions ejected from the nanoplasma. The observations support a recently suggested scenario for nanoplasma dynamics in the wide intensity range, in which crystalline disorder in nanoplasmas is caused by a rarefaction wave propagating at a speed comparable with the average ion speed from the surface toward the inner crystalline core. We demonstrate that the scenario is also applicable to nanoplasma dynamics in the hard x-ray regime. Our results connect the outside nanoplasma dynamics to the loss of structure inside the sample on the femtosecond timescale.
机译：当通过强烈的激光脉冲照射纳米粒子时，它变成纳米载体，转变伴随着许多有趣的非QuiLibimics。到目前为止，大多数关于纳米纳克马斯的实验使用离子测量，反映了纳米粒子中的外部动态。最近，随着X射线自由电子激光器（XFELS）的出现，对纳米颗粒内部的超快结构动力学的直接观察也是可能的。在这里，我们报告了通过强烈近红外激光照射的纳米纳米纳米纳米纳米纳米纳米结构的结构动力学和离子速度的组合测量，控制通过广泛改变激光强度（9×10 14W / cm 2而完成的初始等离子体条件的控制到3×10 16 w / cm 2）。使用XFEL通过时间分辨的X射线衍射检查纳米纳米烷烃的结构变化，而在相同的实验条件下，通过离子对抗方法测量喷射离子的动力学。我们发现纳米烷烃中的晶体失调的时间尺度强烈取决于激光强度和尺度，其呈从纳米载体排出的离子的平均速度的倒数。该观察结果支持宽强度范围内的最近提出的纳米纳米动力学的情况，其中纳米纳米粘血液中的结晶疾病是由与从表面朝向内晶芯的平均离子速度相当的速度传播的稀疏波引起的。我们证明，这种情况也适用于硬X射线制度中的纳米纳米动力学。我们的结果将外部纳米纳卡半动力连接到模型上的样本内的结构丢失。

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