Trapping-desorption and direct-scattering of formaldehyde at Au(111).

Trapping-desorption and direct-scattering of formaldehyde at Au(111).
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Au(111) 上甲醛的捕获-解吸和直接散射

DOI:
10.1039/c7cp03907g
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发表时间:
2017
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
T. Schäfer
T. Schäfer
中科院分区:
--
文献类型:
--
作者:
B. C. Krüger;G. B. Park;S. Meyer;R. J. V. Wagner;A. M. Wodtke;T. Schäfer

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原子、分子和团簇的非反应性表面散射几乎可以普遍地用两种机制来描述:捕获-解吸和直接散射。具有有吸引力的方阱的硬立方体模型提供了这两种机制之间的分支比与入射能量的函数关系的零阶描述。然而,碰撞过程中内部自由度的激发可能会增强捕获过程。在这项分子束表面散射研究中,我们使用角分辨飞行时间技术来表征甲醛/Au(111) 散射。发现这两种机制在所研究的 0.1 至 1.3 eV 之间的正入射能量范围内相互竞争。虽然在低入射能量下俘获-解吸占主导地位,但在入射能量高于 0.37 eV 时直接散射变得更有可能。该入射能略高于解吸能,通过程序升温解吸技术发现解吸能为 0.32 ± 0.03 eV。简单的硬立方体模型低估了观察到的捕获概率,表明内部分子自由度激发引起的捕获的重要性。
Nonreactive surface scattering of atoms, molecules and clusters can be almost universally described by two mechanisms: trapping-desorption and direct-scattering. A hard cube model with an attractive square well provides a zeroth order description of the branching ratio between these two mechanisms as a function of the incidence energy. However, the trapping process is likely to be enhanced by excitation of internal degrees of freedom during the collision. In this molecular beam surface scattering study, we characterize formaldehyde/Au(111) scattering using angle resolved time-of-flight techniques. The two mechanisms are found to compete in the range of the investigated normal incidence energies between 0.1 and 1.3 eV. Whereas at low incidence energies trapping-desorption dominates, direct-scattering becomes more likely at incidence energies above 0.37 eV. This incidence energy is slightly higher than the desorption energy which is found to be 0.32 ± 0.03 eV by temperature programmed desorption techniques. A simple hard cube model underestimates the observed trapping probabilities indicating the importance of trapping induced by excitation of internal molecular degrees of freedom.
DOI: 10.1063/1.4948635
发表时间: 2016
期刊: The Journal of chemical physics
影响因子: --
作者:
G. B. Park;Bastian C. Krüger;S. Meyer;D. Schwarzer;Tim Schäfer
通讯作者: Tim Schäfer
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期刊: Physical Chemistry, Chemical Physics - PCCP
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DOI: --
发表时间: 1989
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DOI: 10.1103/physrevlett.43.1175
发表时间: 1979-01-01
影响因子: 8.6
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HURST, JE;BECKER, CA;AUERBACH, DJ
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DOI: --
发表时间: 1993
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