【摘要】 通过光谱观察 ,考察了激光诱导铜等离子体的动力学过程和等离子体成分的时空行为 .不同能量的等离子体粒子 ,产生的机制不同 ,在时空演变过程中显示的行为不同 ,它们受背景气氛的影响也不同 .更多还原

【Abstract】 By observing the optical emissions from copper plasma induced by laser ablationof a copper target, the dynamics of the plasma and the temporal and spatial behaviors of the plasma species are examined. The plasma is ignited from target ablation, evolves from the breakdown of the copper vapor to collisions between copper particles and energetic electrons. At the initial stage, the plasma contains large amount of copper ions and high-excited copper atoms, and then evolves to have low-energy copper atoms with its main composition. The copper particles with different energies are created by different mechanisms, and behaved differently in time and space. In low pressure argon background, the influence of the background gas on the copper particles at different energy states is found not to be the same.更多还原