Development of laser ablation absorption spectroscopy for nuclear fuel materials: plume expansion behavior for refractory metals observed by laser-induced fluorescence imaging spectroscopy
Development of laser ablation absorption spectroscopy for nuclear fuel materials: plume expansion behavior for refractory metals observed by laser-induced fluorescence imaging spectroscopy
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核燃料材料激光烧蚀吸收光谱的发展：激光诱导荧光成像光谱观察难熔金属的羽流膨胀行为
DOI：
10.1007/s00339-020-3368-0
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
I. Wakaida
中科院分区：
文献类型：
--
作者：
M. Miyabe;M. Oba;K. Akaoka;M. Kato;S. Hasegawa;I. Wakaida
采用激光诱导荧光成像技术研究了三种难熔金属（钛、锆和铪）在低压稀有气体环境下烧蚀羽流的动力学行为。比较了这些元素种类的羽流膨胀行为，揭示了原子量对羽流结构形成的影响。在这些元素中还观察到先前报道的钆的半球形薄层和空腔结构。结果表明，随着原子质量的增加，烟羽尺寸增大，层厚减小。对于基态的钛原子，即使在羽流中心也观察到大量的原子。钛原子羽流的持续时间长达300 μs，明显长于其他物种。此外，在由多元素样品产生的烧蚀羽流中观察到质量依赖的元素分离。这些结果表明，观测到的羽流结构是由离子-电子复合过程和烧蚀物质在与气体原子多次碰撞时的反冲作用引起的。
The dynamic behavior of an ablation plume in low pressure rare gas ambient was investigated with laser-induced fluorescence imaging spectroscopy for three refractory metals, i.e. titanium, zirconium and hafnium. A comparison of the plume expansion behaviors for the species of these elements revealed an atomic weight effect on the plume structure formation. A hemispherical thin layer and cavity structure reported previously for gadolinium were observed also for these elements. It was found that the plume size increases as well as the layer thickness decreases with increasing atomic weight. For ground state atoms of Ti, substantial amount of atoms were observed even at the center of the plume. Also, the persistence of the Ti atomic plume was as long as 300 μs, which was significantly longer than the other species studied. Furthermore, the mass-dependent elemental separation was observed in the ablation plume produced from a multielement sample. These results suggest that the observed plume structure arises from the ion-electron recombination process and the recoil of the ablated species during the multiple collisions with gas atoms.