A comparative study of the enhancement of molecular emission in a spatially confined plume through optical emission spectroscopy and probe beam deflection measurements |
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| Affiliation: | 1. The State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, PR China;2. School of Material Science and Engineering, Wuhan Institute of Technology, Wuhan 430073, PR China;1. Spectroscopy Department, Physics Division, National Research Centre, 33 ElBehouth St., Dokki, 12311, Giza, Egypt;2. Basic and Applied Science, Faculty of Engineering, Arab Academy of Science and Technology, Al-Horria, Heliopolis, Cairo, Egypt;3. Electron Microscope and Thin Films Department, Physics Division, National Research Centre, 33 ElBehouth St., Dokki, 12311, Giza, Egypt;4. Center of Nanotechnology, King Abdulaziz University, Jeddah, Saudi Arabia;1. CERN, PH Department, CH-1211, Geneva 23, Switzerland;2. Laboratory for High Energy Physics, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland;3. H.H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom;4. Department of Physics, University of Oxford, Oxford OXI 3RH, United Kingdom |
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| Abstract: | The spatial confinement effects of shock wave on the expansion of a carbon plume induced by pulsed laser ablation of graphite in air and the enhancement of the plume emission were studied by optical emission spectroscopy and probe beam deflection measurements. A metal disk was set in the way of the ablation-generated shock wave to block and reflect the supersonically propagating shock wave. The reflected shock wave propagated backwards and confined the expanding plume. The optical emission of CN molecules was enhanced in contrast to the case without the block disk and the emission enhancement was dependent on the position of the disk. Based on the results of time-integrated and -resolved optical emission spectroscopy, and the time- and space-resolved probe beam deflection measurements, the processes occurring in the plume were discussed and the mechanisms responsible for the enhancement of molecular emission in the spatially confined plume were investigated. |
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