| Exponential relaxation of the energy and desorption dynamics of atoms colliding with a surface | |
Ceng DD(曾丹丹) ; Jiang JZ(蒋建政); Liu C(刘崇); Fan J(樊菁)
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| Corresponding Author | Liu, Chong([email protected]) ; Fan, Jing([email protected]) |
| Source Publication | PHYSICA SCRIPTA
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| 2024-03-01 | |
| Volume | 99Issue:3Pages:10 |
| ISSN | 0031-8949 |
| Abstract | Atom-surface collisions are one of the most important topics in surface science. To further disclose the physical mechanism underlying atom-surface interaction at the microscopic level, we study the dynamics of an incident atom with a molecular dynamics simulation. Emphasis is put on the temporal evolutions of energy and residence times of the colliding atoms. The incident atoms experience two stages after colliding with the surface. First, the atoms relax to the equilibrium state in an exponential fashion. Then, the atoms become equilibrated with the surface and depart from the surface with a converged desorption rate. Two parameters are proposed to characterize the process: the characteristic energy relaxation time and the equilibrium residence time. At the relaxation stage, the desorption rate varies with the energy, and the probability distribution function (PDF) of the residence time obeys a power law. At the equilibrium state, the desorption rate is invariable, and the PDF of the residence time decays exponentially. We further find that the desorption rate for both stages can be calculated by a consistent Arrhenius equation, with the desorption activation energy and kinetic energy evolving with time in the relaxation stage. It appears that the gas-surface interaction dynamics can be explained by trapping-desorption theory in both the relaxation state and the equilibration state. |
| Keyword | atom-surface interaction energy relaxation residence time molecular dynamics |
| DOI | 10.1088/1402-4896/ad2326 |
| Indexed By | SCI ; EI |
| Language | 英语 |
| WOS ID | WOS:001159677900001 |
| WOS Keyword | CLASSICAL-THEORY ; GAS ATOMS ; MODEL ; AR ; SCATTERING ; STICKING ; PROBABILITY ; WASHBOARD |
| WOS Research Area | Physics |
| WOS Subject | Physics, Multidisciplinary |
| Funding Project | Strategic Priority Research Program of the Chinese Academy of Sciences ; [XDA0340000] |
| Funding Organization | Strategic Priority Research Program of the Chinese Academy of Sciences |
| Classification | 二类 |
| Ranking | 1 |
| Contributor | Liu, Chong ; Fan, Jing |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/94340 |
| Collection | 高温气体动力学国家重点实验室 |
| Recommended Citation GB/T 7714 | Ceng DD,Jiang JZ,Liu C,et al. Exponential relaxation of the energy and desorption dynamics of atoms colliding with a surface[J]. PHYSICA SCRIPTA,2024,99,3,:10.Rp_Au:Liu, Chong, Fan, Jing |
| APA | 曾丹丹,蒋建政,刘崇,&樊菁.(2024).Exponential relaxation of the energy and desorption dynamics of atoms colliding with a surface.PHYSICA SCRIPTA,99(3),10. |
| MLA | 曾丹丹,et al."Exponential relaxation of the energy and desorption dynamics of atoms colliding with a surface".PHYSICA SCRIPTA 99.3(2024):10. |
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