The interaction of CO with Ni(111): Rainbows and rotational trapping
The interaction of CO with Ni(111): Rainbows and rotational trapping
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CO 与 Ni(111) 的相互作用：彩虹和旋转捕获
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
R. Zare
中科院分区：
文献类型：
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作者：
M. Hines;R. Zare
使用 (2+1) 共振增强多光子电离测量从干净的单晶 Ni(111) 表面散射和解吸的 CO 的角分辨旋转态分布。从表面散射的分子表现出高度非玻尔兹曼旋转分布，该分布随入射平动能和检测角度而变化，但不随表面温度而变化。在散射分布中看到旋转彩虹，并解释为 CO 分子的弱吸引力 O 端与 Ni(111) 表面相互作用产生的。在 0.26-0.45 eV 的入射平移能量下，观察到总旋转平移能量转换。这种能量截止是旋转捕获的结果，是由分子 C 端与表面的强烈吸引力相互作用引起的。从 Ni(111) 表面解吸的分子的旋转状态分布与温度为 0.82±0.08 o 的玻尔兹曼分布很好地拟合。
Angularly resolved rotational state distributions of CO scattered and desorbed from a clean, single‐crystal Ni(111) surface were measured using (2+1) resonance‐enhanced multiphoton ionization. Molecules scattered from the surface displayed highly non‐Boltzmann rotational distributions that varied with incident translational energy and detection angle, but not with surface temperature. A rotational rainbow was seen in the scattering distribution and interpreted as arising from the interaction of the weakly attractive O end of the CO molecule with the Ni(111) surface. Up to total rotational‐to‐translational energy conversion was seen at incident translational energies of 0.26–0.45 eV. This energetic cutoff was the result of rotational trapping and was caused by the strongly attractive interaction of the C end of the molecule with the surface. The rotational state distributions of molecules desorbed from the Ni(111) surface were well fit by Boltzmann distributions each with a temperature which is 0.82±0.08 o...