The dynamics of krypton trapping on Pt(111) at 50 K: experiment and molecular dynamics simulation

被引：2

作者：

Carlsson, AF ^{[1
]}

Madix, RJ ^{[1
]}

机构：

[1] Stanford Univ, Dept Chem Engn, Stanford, CA 94305 USA

来源：

SURFACE SCIENCE | 2001年 / 487卷 / 1-3期

关键词：

molecule-solid scattering and diffraction -inelastic; energy dissipation; physical adsorption; sticking; platinum; noble gases; molecular dynamics;

D O I：

10.1016/S0039-6028(01)01099-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The dynamics of krypton trapping on clean Pt(1 1 1) were investigated using supersonic molecular beam techniques at a surface temperature of 50 K.. The initial trapping probability of Kr scales with normal incident energy (E-T cos(2)theta), indicating a smooth gas-surface potential. The Kr trapping probability decreases from 0.8 to 0 as the incident normal energy is increased from 2 to 23 kJ/mol. Trapping on the krypton-saturated monolayer is greatly enhanced at all incident energies and angles compared to the clean surface, and exhibits near total energy scaling (ET cos(2)theta), indicating a corrugated gas-surface potential. Stochastic trajectory simulations [J. Chem. Phys. 105 (1996) 1609] using a Morse potential with parameters based on simulations of Ar trapping [J. Chem. Phys. 94 (1991) 1516] agree with the experimentally measured energy and angular dependence of the trapping probability of Kr. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：201 / 209

页数：9

共 45 条

[1] COVERAGE DEPENDENCE OF MOLECULAR ADSORPTION DYNAMICS - ETHANE ON PT(111) [J].

ARUMAINAYAGAM, CR ;

MCMASTER, MC ;

MADIX, RJ .

JOURNAL OF PHYSICAL CHEMISTRY, 1991, 95 (06) :2461-2465

[2] ADSORBATE-ASSISTED ADSORPTION - TRAPPING DYNAMICS OF XE ON PT(111) AT NONZERO COVERAGES [J].

ARUMAINAYAGAM, CR ;

STINNETT, JA ;

MCMASTER, MC ;

MADIX, RJ .

JOURNAL OF CHEMICAL PHYSICS, 1991, 95 (07) :5437-5443

[3] TRAPPING DYNAMICS OF XENON ON PT(111) [J].

ARUMAINAYAGAM, CR ;

MADIX, RJ ;

MCMASTER, MC ;

SUZAWA, VM ;

TULLY, JC .

SURFACE SCIENCE, 1990, 226 (1-2) :180-190

[4]

Baule B, 1914, ANN PHYS-BERLIN, V44, P145

[5] VAN DER WAALS VOLUMES + RADII [J].

BONDI, A .

JOURNAL OF PHYSICAL CHEMISTRY, 1964, 68 (03) :441-+

[6] Trapping of Ar on well ordered Ar, Kr, and Xe overlayers on Pt(111) at 30 K [J].

Carlsson, AF ;

Madix, RJ .

SURFACE SCIENCE, 2000, 470 (1-2) :62-80

[7] Alkane trapping onto structured alkane monolayers on Pt(111) at low temperature [J].

Carlsson, AF ;

Madix, RJ .

JOURNAL OF PHYSICAL CHEMISTRY B, 2000, 104 (51) :12237-12249

[8] The dynamics of argon and methane trapping on Pt(111) at 30 and 50 K: energy scaling and coverage dependence [J].

Carlsson, AF ;

Madix, RJ .

SURFACE SCIENCE, 2000, 458 (1-3) :91-105

[9]

CARLSSON AF, UNPUB J CHEM PHYS

[10] ADSORPTION OF HYDROGEN ON A PT(111) SURFACE [J].

CHRISTMANN, K ;

ERTL, G ;

PIGNET, T .

SURFACE SCIENCE, 1976, 54 (02) :365-392

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