研究目的
Investigating the transport dynamics of the laser-ablated particles in a low pressure inert gas.
研究成果
The direct simulation Monte Carlo method with an instantaneous density dependent mean-free-path of the ablated particles and the Ar gas is applied to demonstrate the main features of the gas dynamics for PLA in the low-pressure gas. The results of Monte Carlo simulation approximately agree with the experimental data at the pressure of 8 Pa to 17 Pa in the Ar gas.
研究不足
The discrepancy between the experimental data and our simulated results increases with the pressure increase, which may be attributed to the absence of the Si nanoparticle growth process.
1：Experimental Design and Method Selection:
A Monte Carlo simulation method with an instantaneous density dependent mean-free-path of the ablated particles and the Ar gas is developed.
2：Sample Selection and Data Sources:
The ablated particles are composed of ions, atoms, electrons and target fragments etc. The initial density is
3：66×1026 m?3, the radial average velocity is 1760 m/s and the total number is 01×List of Experimental Equipment and Materials:
Ar is taken as working gas at pressures of 8 Pa, 11 Pa, 13 Pa or 17 Pa and the target-to-substrate distance is 20 mm.
4：Experimental Procedures and Operational Workflow:
The simulation begins from the ablated particles just out of the Knudsen layer. The mean-free-path is calculated based on instantaneous densities of the ablated particles and the gas atoms.
5：Data Analysis Methods:
The force acting on the ablated particles is calculated by a theorem of momentum, F =dp/dt.
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