Dynamics of the desorption of D2 and H2 from Cu(111)
Dynamics of the desorption of D2 and H2 from Cu(111)
复制标题
Cu(111) 中 D2 和 H2 解吸的动力学
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
D. Auerbach
中科院分区：
文献类型：
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作者：
C. Rettner;H. Michelsen;D. Auerbach
我们已经确定了Cu（111）解吸的D2和H2的旋转和振动分布，并确定了解吸分子在大范围振动和旋转状态下的速度分布。量子态居群显示出与玻尔兹曼分布的强烈偏差，速度分布是高度超音速的，其特性强烈依赖于量子态。在925 K下解吸的分子用激光电离以特定状态的方式检测。通过测量D+2离子在无场区域的飞行时间，得到了速度分布。D2（v=1）、D2（v=2）和H2（v=1）的振动居群分别比预期在925 K时达到平衡的居群高出20倍、79倍和18倍。转动态分布的玻尔兹曼图显示出明显的曲率，特别是对于处于基振态的分子。H2和D2分子在基态的平均动能为。
We have determined rotational and vibrational distributions for D2 and H2 desorbed from Cu(111) and have determined velocity distributions of the desorbed molecules for a wide range of vibrational and rotational states. The quantum state populations display strong deviations from a Boltzmann distribution, and the velocity distributions are highly supersonic with properties that depend strongly on quantum state. Molecules desorbed at 925 K were detected in a state‐specific manner using laser ionization. Velocity distributions were obtained by measuring the flight times of D+2 ions in a field‐free region. Vibrational populations of D2(v=1), D2(v=2), and H2(v=1) were found to be a factor of 20, 79, and 18 above that expected for equilibration at 925 K, respectively, relative to v=0 populations. Boltzmann plots of the rotational state distributions display distinct curvature, particularly for molecules in the ground vibrational state. H2 and D2 molecules in the ground vibrational state have mean kinetic energ...