Exponential relaxation of the energy and desorption dynamics of atoms colliding with a surface

doi:10.1088/1402-4896/ad2326

CORC > 力学研究所 > 中国科学院力学研究所 > 高温气体动力学国家重点实验室

	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)
刊名	PHYSICA SCRIPTA
	2024-03-01
卷号	99 期号:3 页码:10
关键词	atom-surface interaction energy relaxation residence time molecular dynamics
ISSN号	0031-8949
DOI	10.1088/1402-4896/ad2326
通讯作者	Liu, Chong(chongliu@imech.ac.cn) ; Fan, Jing(jfan@imech.ac.cn)
英文摘要	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.
分类号	二类
资助项目	Strategic Priority Research Program of the Chinese Academy of Sciences ; [XDA0340000]
WOS关键词	CLASSICAL-THEORY ; GAS ATOMS ; MODEL ; AR ; SCATTERING ; STICKING ; PROBABILITY ; WASHBOARD
WOS研究方向	Physics
语种	英语
WOS记录号	WOS:001159677900001
资助机构	Strategic Priority Research Program of the Chinese Academy of Sciences
其他责任者	Liu, Chong ; Fan, Jing
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/94339]
专题	力学研究所_高温气体动力学国家重点实验室
推荐引用方式 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.
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.