Hyperthermal Ar atom scattering from a C(0001) surface
Hyperthermal Ar atom scattering from a C(0001) surface
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DOI：
10.1063/1.2924126
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发表时间：
2008-06-14
影响因子：
4.4
通讯作者：
Troya, Diego
中科院分区：
文献类型：
--
作者：
Gibson, K. D.;Sibener, S. J.;Troya, Diego
对超高温Ar原子在C（0001）面上的散射进行了实验和模拟。在入射角、入射能量（2.8-14.1 eV）和表面温度（150-700 K）的范围内测量散射Ar通量的能量和角分布。在所有情况下，散射集中在一个狭窄的超镜面峰值，与表面的显着的能量交换。模拟结果与实验观察结果非常接近。与最近关于石墨的超热散射的实验不同[Watanabe，Eur. Phys.J.D38，103（2006）]，能量损失的角度依赖性不能通过硬立方体模型来近似。模拟被用来调查为什么平行动量守恒描述的石墨表面的Ar散射，而不是Ar散射。这些研究扩展了我们的知识气体-表面碰撞能量转移的超高温制度，也表明了现实的数值模拟建模这样的遭遇的重要性。(c)2008年美国物理学会。
Experiments and simulations on the scattering of hyperthermal Ar from a C(0001) surface have been conducted. Measurements of the energy and angular distributions of the scattered Ar flux were made over a range of incident angles, incident energies (2.8-14.1 eV), and surface temperatures (150-700 K). In all cases, the scattering is concentrated in a narrow superspecular peak, with significant energy exchange with the surface. The simulations closely reproduce the experimental observations. Unlike recent experiments on hyperthermal Xe scattering from graphite [Watanabe , Eur. Phys. J. D 38, 103 (2006)], the angular dependence of the energy loss is not approximated by the hard cubes model. The simulations are used to investigate why parallel momentum conservation describes Xe scattering, but not Ar scattering, from the surface of graphite. These studies extend our knowledge of gas-surface collisional energy transfer in the hyperthermal regime, and also demonstrate the importance of performing realistic numerical simulations for modeling such encounters. (c) 2008 American Institute of Physics.