Spectroscopic study of ablation and recombination processes in a laser-produced ZnO plasma
Spectroscopic study of ablation and recombination processes in a laser-produced ZnO plasma
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DOI：
10.1063/1.2190715
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发表时间：
2006-04
影响因子：
3.2
通讯作者：
S. Namba;Ryoichi Nozu;K. Takiyama;T. Oda
中科院分区：
文献类型：
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作者：
S. Namba;Ryoichi Nozu;K. Takiyama;T. Oda
通过光谱观察研究了激光产生的氧化锌等离子体的特性。特别是在原子物理学的基础上，研究了真空或气体（氦或氧）气氛下的烧蚀动力学和复合过程。在激光照射过程中和照射后，利用连续谱和谱线推导出等离子体参数，如电子温度和电子密度。此外，通过发射光谱的飞行时间瞬态测定了离子和原子的膨胀速度。对于膨胀等离子体在真空中的中和过程，发现辐射复合在等离子体中和过程中占主导地位。另一方面，在氦大气中观测到的长时间明亮的辐射大致呈球形。这可以用从目标喷射出的粒子散射和由于与周围气体碰撞而导致的等离子体快速冷却来解释。因此，三体重组负责…
Characteristics of laser-produced ZnO plasmas have been investigated by spectroscopic observations. In particular, the ablation dynamics and recombination process in vacuum or gas atmospheres (helium or oxygen) were studied on the basis of atomic physics. During and immediately after a laser irradiation, plasma parameters, such as electron temperature and electron density, were deduced from continuum and line spectra. In addition, the expansion velocities of ions and atoms were determined by time-of-flight transients of the emission spectra. As for the neutralization process of the expanding plasmas in vacuum, it was found that the radiative recombination dominated the plasma neutralization process. On the other hand, long-lived bright emissions that had a roughly spherical shape were observed in a helium atmosphere. This can be explained by the scattering of particles ejected from the target and rapid plasma cooling due to the collision with an ambient gas. Thus, the three-body recombination responsible ...