期刊
JOURNAL OF APPLIED PHYSICS
卷 107, 期 2, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3282683
关键词
aluminium; high-speed optical techniques; localised states; luminescence; plasma production by laser; plasma transport processes; plasma-beam interactions; surface states; time resolved spectra
资金
- Science Foundation Ireland [PHY041]
- SFI PI [07/IN.1/I1771]
- HEA PRTLI IV INSPIRE program
- Embark Scholarship Scheme of the Irish Research Council for Science Engineering and Technology
- DCU
The expansion dynamics of ion and neutral species in laterally colliding laser produced aluminum plasmas have been investigated using time and space resolved optical emission spectroscopies and spectrally and angularly resolved fast imaging. The emission results highlight a difference in neutral atom and ion distributions in the stagnation layer where, at a time delay of 80 ns, the neutral atoms are localized in the vicinity of the target surface (< 1 mm from the target surface) while singly and doubly charged ions lie predominantly at larger distances, < 1.5 and < 2 mm, respectively. The imaging results show that the ions were found to form a well defined, but compressed, stagnation layer at the collision front between the two seed plasmas at early times (Delta t < 80 ns). On the other hand, the excited neutrals were observed to form a V-shaped emission feature at the outer regions of the collision front with enhanced neutral emission in the less dense, cooler regions of the stagnation layer.
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