The search for direct vibrational excitation in gas–surface collisions of CO with Au(111)
The search for direct vibrational excitation in gas–surface collisions of CO with Au(111)
复制标题
寻找 CO 与 Au(111) 气体表面碰撞中的直接振动激发
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
C. Rettner
中科院分区：
文献类型：
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作者：
C. Rettner
我研究了CO/Au(111)体系的能量转移动力学，以确定直接振动激发的几率。与以前对NO/Ag(111)、NH3/Au(111)和H2/Cu(111)的研究不同，没有观察到直接的振动激发。用分子束技术控制碰撞能Ei和角θi，用激光电离探测探测散射分子的内态分布。当表面温度ts为300K和800K，−i=10°时，对于Ei~1.4 eV，直接振动激发几率保持在10θ3以下。我还测定了CO(v=1)与Au(111)碰撞的退激几率。在不确定度范围内(∼20%)，ts=300K的Ei在0.21.1 eV范围内没有明显的退激现象，Ts=800K，Ei=1.1 eV时，存活几率也与单位数无明显差别。作为这项研究的一部分，我已经确定了CO在Au(111)面上捕获几率的变化。
I have examined the dynamics of energy transfer in the CO/Au(111) system to determine the probability of direct vibrational excitation. In contrast to earlier studies of NO/Ag(111), NH3/Au(111), and H2/Cu(111), no direct vibrational excitation is observed. Measurements have been made using molecular beam techniques to control the collision energy Ei and angle θi and using laser ionization detection to probe the internal state distributions of the scattered molecules. The probability of direct vibrational excitation is found to remain below 10−3 for Ei up to 1.4 eV at surface temperatures Ts of 300 and 800 K and θi=10°. I have also determined the probability of deexcitation for CO(v=1) colliding with Au(111). Within the uncertainties (∼20%), no deexcitation is apparent for Ei in the range 0.2–1.1 eV with Ts=300 K. With Ts=800 K and Ei=1.1 eV, the survival probability was also indistinguishable from unity. As part of this study, I have determined the variation of the trapping probability of CO on Au(111) as...