arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1408.6402cond-mat.mtrl-sciphysics.chem-ph
收藏

O $_2$在Ag(111)表面解离吸附的二维量子动力学

Two-Dimensional Quantum Dynamics of O$_2$ Dissociative Adsorption on Ag(111)

Yuji Kunisada, Norihito Sakaguchi

摘要:

研究了O2在Ag(111)表面解离吸附的量子动力学。我们进行了计算与哈密顿O2的平移运动是垂直于表面和O2的振动能量。我们发现,发生解离吸附与入射的平移能量低于预期的活化势垒,而吸附概率的能量依赖是一个光滑的S形。因此,有不可忽略的隧道效应的解离吸附的活化势垒宽度的影响。此外,在吸附几率的拐点处的入射平移能随着入射O2的振动量子数的增加而降低。因此,存在从振动到平移运动的显著能量传递和耦合。振动能通过振动辅助粘附效应辅助O2解离吸附。

英文摘要:

We have investigated the quantum dynamics of O2 dissociative adsorption on a Ag(111) surface. We performed the calculations with a Hamiltonian where the O2 translational motion is perpendicular to the surface and for O2 vibrational energy. We found that dissociative adsorption occurs with an incident translational energy below the expected activation barrier, while the translational-energy dependence for adsorption probabilities is a smooth sigmoid. Thus, there are non-negligible tunneling effects in the dissociative adsorption that are affected by the activation barrier width. Moreover, the incident translational energies at the inflection points of the adsorption probabilities shift lower with increasing in vibrational quantum numbers of the incident O2. Thus, there is significant energy transfer and coupling from vibration to translational motion. The vibrational energy assists the O2 dissociative adsorption via a vibrationally assisted sticking effect.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑