Characterization of kinetic energy distributions of ions in high laser irradiance via orthogonal time-of-flight mass spectrometry

Characterization of kinetic energy distributions of ions in high laser irradiance via orthogonal time-of-flight mass spectrometry
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通过正交飞行时间质谱法表征高激光辐照度下离子的动能分布

DOI:
10.1016/j.sab.2012.06.024
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发表时间:
2012-10
期刊:
Spectrochimica ACTA B
影响因子:
--
通讯作者:
杭纬
杭纬
中科院分区:
其他
文献类型:
--
作者:
杭纬

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本文通过测量Al ~+、Mn ~+、Nb ~+、In ~+、Ta ~+和Bi ~+等金属离子在低压背景气体中的激光电离时间分布和动能分布,研究了这些金属离子在低压背景气体中的激光电离特性。采用调Q Nd:YAG激光器,激光波长为532 nm,激光辐照度为1.0× 10 ~(10)W/cm ~ 2。动能被发现是相同的所有烧蚀物种在给定的压力下,无论原子质量。羽流的传播从0.5Pa的自由膨胀转变为50 Pa的碰撞和冲击波状的流体动力学膨胀。在500- 1500 Pa范围内存在羽流分裂现象,在此区域,只有快速分量可以用接地的喷嘴电压观察到。随着喷嘴电压的增加,发现具有增加的动能的热化分量取决于喷嘴电压。
The characteristics of laser ionization in low pressure background gas have been investigated through the measurement of temporal and kinetic energy distributions of Al+, Mn+, Nb+, In+, Ta+, and Bi+produced from a disk comprised of these metallic elements. A Q-switched Nd:YAG laser was utilized with a laser beam at 532nm of wavelength and 1.0×1010W/cm2of laser irradiance. The kinetic energy was found to be the same for all ablated species at the given pressure, regardless of the atomic mass. The plume propagation translates from a free expansion at 0.5Pa to a collisional and shockwave-like hydrodynamic expansion at 50Pa. A plume splitting exists at 500–1500Pa where only the fast component can be observed with a grounded nozzle voltage. As the nozzle voltage grows up, the thermalized component with increased kinetic energy is found depending on the nozzle voltage.
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