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首页> 外文期刊>The Journal of Chemical Physics >A comparative study of the scattering of highly energetic atomic and molecular beams from metallic surfaces
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A comparative study of the scattering of highly energetic atomic and molecular beams from metallic surfaces

机译：金属表面高能原子束和分子束散射的比较研究

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摘要

Time-of-flight spectra (TOF) of supersonic He and D-2 beams in the energy range 100 less than or equal to E-i less than or equal to 250 meV have been measured after scattering from a clean Cu(001) surface at surface temperatures between 100 and 950 K. The TOF spectra of both: He and D-2 exhibit broad featureless distributions over the whole range of incident beam energies and surface temperatures. The intensities of the He TOF spectra are a factor of 5 to 7 higher than those of D-2 when the incident beam energies are the same and below 200 meV. For the highest incident beam energies E-i greater than or equal to 200 meV and surface temperatures T-s > 700 K the difference between the He and D-2 TOF spectra reduces to about a factor of 3. A theoretical model is employed which reproduces the TOF spectra to a very good approximation. The comparison of the best-fit parameters for He and D-2 provides valuable information on the interaction parameters and their dependence on incident energy. The analysis of the energy and temperature dependence of the peak intensities of the D-2 TOF spectra allows for the separation of the contribution of rotational excitations in the collision mechanism. (C) 1998 American Institute of Physics. [References: 40]
机译：从表面干净的Cu（001）表面散射后，已经测量了能量小于或等于Ei小于或等于250 meV的100范围内的超声波He和D-2束的飞行时间光谱（TOF） He和D-2的TOF光谱在入射光束能量和表面温度的整个范围内均表现出无特征的宽分布。当入射光束能量相同且低于200 meV时，He TOF光谱的强度比D-2的强度高5到7倍。对于大于或等于200 meV的最高入射光束能量Ei和表面温度Ts> 700 K，He和D-2 TOF光谱之间的差异减小到大约3倍。采用了一个理论模型来再现TOF光谱非常好的近似He和D-2的最佳拟合参数的比较提供了有关相互作用参数及其对入射能量的依赖性的有价值的信息。对D-2 TOF谱峰强度的能量和温度依赖性的分析，可以分离碰撞机理中旋转激发的贡献。 （C）1998美国物理研究所。 [参考：40]

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