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A New Dynamics Expansion Mechanism for Plasma during Pulsed Laser Deposition |
| TAN Xin-Yu1,2;ZHANG Duan-Ming2,FENG Sheng-Qin1;LI Zhi-Hua2;LIU Gao-Bin2;FANG Ran-Ran2;SUN Min2 |
| 1Department of Physics, China Three Gorges University, Yichang 4430022Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 |
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| Cite this article: |
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TAN Xin-Yu, ZHANG Duan-Ming, FENG Sheng-Qin et al 2008 Chin. Phys. Lett. 25 198-201 |
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Abstract The dynamics expansion mechanisms for plasma plume generated by pulsed laser radiation are studied in detail, taking account of plasma ionization effect. Based on the consideration of local conservations of mass, momentum, collected as the assumption that plasma can be viewed as compressible ideal fluid and high temperature-high pressure ideal gas, we develop a new dynamics expansion mechanism for plasma produced by pulsed laser radiation. Using the analytical method, the space number density and pressure evolvement of plasma in cylindrical coordinate are obtained, the dynamics evolvement equations are also derived. The results from the present model indicate that the plasma dynamic expansion behaviour can be evidently influenced by the ionization fraction η. Its effect is similar to a new dynamic source for plasma expansion and increases the expansion acceleration in all directions. The predictions of the expansion of the plasma is
affected by the temperature, the average atoms mass and the ionization degree of the plasma are consistent with the experimental results.
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52.38.Mf
47.11.-j
52.30.-q
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Received: 09 June 2007
Published: 27 December 2007
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