在薄弱的电子 - 声波合表面上吸附的CO的Femtosecond激光诱导的扩散和脱离:Cu(110)
Federico J Gonzalez1, Alberto S Muzas2,3, J Iñaki Juaristi2,4,5
1Grupo de Fisicoquímica en Interfases y Nanoestructuras, Instituto de Física Rosario (IFIR), CONICET-UNR, Bv. 27 de Febrero 210 bis, S2000EKF Rosario, Argentina.
The Journal of chemical physics
|May 1, 2025
概括
五秒激光照射驱动一氧化碳 (CO) 在铜表面的扩散更有效地在一个方向由于较低的能量障碍. 电子孔相互作用是这些超快速表面动态的关键.
科学领域:
- 表面科学是一门学科.
- 物理化学 物理化学
- 计算材料科学科学 计算材料科学
背景情况:
- 了解超快速表面动态对于催化和材料科学至关重要.
- 五秒激光照射显著改变了表面特性和吸附物行为.
- 像铜 (Cu) 这样的金属表面上一氧化碳 (CO) 的化学吸收是一个基本的系统.
研究的目的:
- 为了研究femtosecond激光照射对在Cu(110) 表面上化学吸收的CO分子的影响.
- 为了阐明激光诱导CO在金属表面的扩散和脱落背后的机制.
- 探索电子 - 声子合在超快速表面过程中的作用.
主要方法:
- 使用双温度模型进行分子动力学 (MD) 模拟.
- 一个从密度函数理论 (DFT) 获得的潜在能量表面,并通过人工神经网络进行参数化.
- 在不同激光流动下分析能量障碍,扩散途径和脱吸概率.
主要成果:
- 激光照射诱导CO的异构扩散,由于能量屏障较低 (0.12 eV对0.49 eV),有利于 [1̄10]方向.
- 光诱导脱附,一个内热过程,显示了功率定律对激光流动的依赖.
- 模拟表明,电子孔浴相互作用是光诱导过程的主要驱动因素,而声子倾向于抑制吸附剂动力学.
结论:
- 这项研究提供了对Cu上激光诱导的CO扩散的异构性质的见解.
- 电子 - 声子合在超快的表面动力学中起着重要作用,影响扩散和脱吸.
- 这些发现促进了对非平衡条件下的表面过程的理解,并鼓励进一步的实验验证.
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