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Characteristics of indirect laser-induced plasma from a thin film of oil on a metallic substrate

Frontiers of physics 2015年第2期10卷 115-123页

作者：修俊山白雪石 Vincent Motto-Ros 俞进 Department of Sciences Shandong University of Technology Zibo 255049 China Institut Lumiere Matiere UMR5306 Universite Lyon 1-CNRS Universite de Lyon 69622 Villeurbanne Cedex France

Optical emissions from the major and trace elements embodied in a transparent gel prepared from cooking oil were detected after the gel was spread in a thin film on a metallic substrate. Such emissions are due to the indirect breakdown of the coating layer. The generated plasma, a mixture of substances from the substrate, the layer, and the ambient gas, was characterized using emission spectroscopy. The characteristics of the plasma formed on the metal with and without the coating layer were investigated. The results showed that A1 emission induced from the aluminum substrates coated with oil films extends away from the target surface to ablate the oil film. This finally formed a bifurcating circulation of aluminum vapor against a spherical confinement wall in the front of the plume, which differed from the evolution of the plasma induced from the uncoated aluminum target. The strongest emissions of elements from the oil films can be observed at 2 mm above the target after a detection delay of 1.0μs. A high temperature zone has been observed in the plasma after the delay of 1.0 μs for the plasma induced from the coated metal. This higher temperature determined in the plasma allows the consideration of the sensitive detection of trace elements in liquids, gels, biological samples, or thin films.

关键词： indirect laser-induced plasma thin layer aluminum substrate higher temperature

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Preparation of 1-Trifluoroethyl-4-methoxy-5-chloropyridazin-6-one: Methyl Shift of 4-Methoxy-5-chloropyridazin-6-one

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有机化学 2003年第Z1期23卷 30-31页

作者： LIN Gui-Chun YANG Zhen-Jun ZHANG Liang-Ren LIU Li ZHANG Li-He The State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Health Science Center Beijing 100083 The State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Health Science Center Beijing 100083 The State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Health Science Center Beijing 100083 The State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Health Science Center Beijing 100083 The State Key Laboratory of Natural and Biomimetic Drugs School of Pharmaceutical Sciences Peking University Health Science Center Beijing 100083

　　N1-Trifluoroethyl-4-methoxy-5-chloro-3-pyridazone (4) was synthesized by the substitution reaction of 4methoxy-5-chloro-3-pyridazone (1) with trifluoroethyl trifluoromethanesulfonate (A) at basic condition. In the most of reaction conditions, N1-methyl-4-methoxy-5-chloro-3-pyridazone (2) was obtained as a major by-product, which means that the methyl group in the 4-methoxy shifted to N-1 position inter-molecularly aided by A or trifluoroethyl methanesulfonate (B). We obtained N1-methyl-4-trifluoro-ethoxy-5-chloro-3-pyridazone (3) in the reaction of 1 with B at higher temperature in different solvents with different yield (Table 1 ), which mechanism was shown in Figure 1. When we tried to synthesize 4 in the reaction of 1 with trifluoroethyl toluenesulfonate under basic condition, 6 was obtained (Figure 2). All the detailed mechanisms are undergoing investigated.……

关键词： substitution reaction higher temperature

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