期刊
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
卷 126, 期 3, 页码 -出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-020-3368-0
关键词
Laser-induced fluorescence spectroscopy; Laser ablation; Ablation plume structure; LIBS; Refractory metals
资金
- JSPS KAKENHI [JP18H01922]
- Nuclear Energy Science & Technology and Human Resource Development Project (through concentrating wisdom) from the Japan Atomic Energy Agency/Collaborative Laboratories for Advanced Decommissioning Science
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 mu s, 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.
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