Translational Inelasticity of NO and CO in Scattering from Ultrathin Metallic Films of Ag/Au(111)

被引：10

作者：

Steinsiek, Christoph ^{[1
]}

Shirhattii, Pranav R. ^{[1
,3
,4
]}

Geweke, Jan ^{[1
,3
,5
]}

Lau, Jascha A. ^{[1
,3
]}

Altschaeffel, Jan ^{[1
,3
]}

Kandratsenka, Alexander ^{[1
,3
]}

Bartels, Christof ^{[1
,6
]}

Wodtke, Alec M. ^{[1
,2
,3
,5
]}

机构：

[1] Georg August Univ Gottingen, Inst Phys Chem, Tammannstr 6, D-37077 Gottingen, Germany

[2] Georg August Univ Gottingen, Int Ctr Adv Studies Energy Convers, Tammannstr 6, D-37077 Gottingen, Germany

[3] Max Planck Inst Biophys Chem, Dept Dynam Surfaces, Fassberg 11, D-37077 Gottingen, Germany

[4] Tata Inst Fundamental Res, 36-P Gopanapally Village, Hyderabad 500107, India

[5] Ecole Polytech Fed Lausanne, Max Planck EPFL Ctr Mol Nanosci & Technol, Inst Chem Sci & Engn ISIC, Stn 6, CH-1015 Lausanne, Switzerland

[6] Univ Freiburg, Phys Inst, Hermann Herder Str 3, D-79104 Freiburg, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2018年 / 122卷 / 33期

关键词：

GAS-SURFACE COLLISIONS; DIRECT VIBRATIONAL-EXCITATION; INITIO MOLECULAR-DYNAMICS; TOTAL-ENERGY CALCULATIONS; WAVE BASIS-SET; AU(111); GROWTH; AG; AG(111); SYSTEM;

D O I：

10.1021/acs.jpcc.8b04158

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：

We investigated translational inelasticity in molecular beam surface scattering of NO and CO from ultrathin metallic films of Ag with atomically defined thicknesses grown on single-crystal Au(111). For both molecules, we observe a gradual decrease of the mean final translational energy for Ag film thicknesses between 0 and 3 ML after which no thickness dependence is seen. For Ag films with thicknesses greater than 3 ML, observations are indistinguishable from those of scattering experiments performed on pure Ag crystal surfaces. The similar behavior of both molecules suggests that translational inelasticity is dominated by the mechanical properties of the surface. Theory predicts a thickness-dependent trend of the phonon spectrum that can qualitatively explain the observed behavior.

引用

页码：18942 / 18948

页数：7

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