Observation of direct vibrational excitation in gas-surface collisions of CO with Au(111): a new model system for surface dynamics.
Observation of direct vibrational excitation in gas-surface collisions of CO with Au(111): a new model system for surface dynamics.
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CO 与 Au(111) 气体表面碰撞中直接振动激发的观察:一种新的表面动力学模型系统
DOI:
10.1039/c2cp43351f
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发表时间:
2013
期刊:
影响因子:
--
通讯作者:
Alec M. Wodtke
中科院分区:
文献类型:
--
作者:
Tim Schäfer;Nils Bartels;Kai Golibrzuch;Christof Bartels;Hansjochen Köckert;Daniel J. Auerbach;Theofanis N. Kitsopoulos;Alec M. Wodtke
We report vibrational excitation of CO from its ground (v = 0) to first excited (v = 1) vibrational state in collision with Au(111) at an incidence energy of translation of EI = 0.45 eV. Unlike past work, we can exclude an excitation mechanism involving temporary adsorption on the surface followed by thermalization and desorption. The angular distributions of the scattered CO molecules are narrow, consistent with direct scattering occurring on a sub-ps time scale. The absolute excitation probabilities are about 3% of those expected from thermal accommodation. The surface temperature dependence of excitation, which was measured between 373 and 973 K, is Arrhenius-like with an activation energy equal to the energy required for vibrational excitation. Our measurements are consistent with a vibrational excitation mechanism involving coupling of thermally excited electron–hole pairs of the solid to CO vibration.
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DOI:
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