A New Dynamics Expansion Mechanism for Plasma during Pulsed Laser Deposition  

作　　者：谭新玉 张端明 冯笙琴 李智华 刘高斌 房然然 孙敏 

机构地区：[1]Department of Physics, China Three Gorges University, Yichang 443002 [2]Department of Physics, Huazhong University of Science and Technology, Wuhan 430074

出　　处：《Chinese Physics Letters》2008年第1期198-201,共4页中国物理快报（英文版）

基　　金：Supported by National Natural Science Foundation of China under Grant Nos 10604017 and 10675048, the Key Programme of the Education Branch of Hubei Province under Grant Nos 2004Z002, and the Key Programme of China Three Gorges University under Grant No 2003C02.

摘　　要：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.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.

关 键 词：DIAMOND-LIKE CARBON ACCELERATED EXPANSION ABLATED MATERIALS SOLID-SURFACE FILMS GAS PLUME 

分 类 号：O53[理学—等离子体物理]