Low-Temperature Surface Diffusion on Metallic Surfaces

被引：3

作者：

Bulou, H. ^{[1
]}

Scheurer, F. ^{[1
]}

Boeglin, C. ^{[1
]}

Ohresser, P. ^{[2
]}

Stanescu, S. ^{[2
]}

Gaudry, E. ^{[3
]}

机构：

[1] Univ Strasbourg, CNRS, UMR 7504, Inst Phys & Chim Mat Strasbourg, F-67034 Strasbourg 2, France

[2] Synchrotron SOLEIL, F-91192 Gif Sur Yvette, France

[3] Ecole Mines, Inst Natl Polytech Lorraine, CNRS, LSG2M,UMR 7584, F-54042 Nancy, France

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 11期

关键词：

MAGNETIC CIRCULAR-DICHROISM; SELF-DIFFUSION; CU ADATOMS; HYDROGEN; CU(100); NUCLEATION; MORPHOLOGY; BARRIERS; NI(100); ATOMS;

D O I：

10.1021/jp805674n

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 present a study of the atomic surface diffusion at low temperature of Cr adatoms deposited on Cu(100), Cu(111), and Au(111) surfaces. Time-dependent X-ray magnetic circular dichroism (XMCD), Monte Carlo simulations, and the Kimball-Shortley iterative method are used to evidence a mechanism of quantum tunneling involved in the Cr adatom surface diffusion at temperatures below 40 K. We show that the XMCD line shape is correlated to the atomic configuration of Cr deposited on a metallic surface. A diffusion rate ranging from 0.03 Hz for Cu(100) to 30 Hz for Au(111) at 10 K is reported from the time evolution of the XMCD line shape. A quantum equation of motion for the Cr adatom is derived and solved by using a Kimball-Shortley iterative method. Good agreement between the calculated Bohr periods and the experimental diffusion rates is reported.

引用

页码：4461 / 4467

页数：7

共 43 条

[1] Collective and single particle diffusion on surfaces [J].

Ala-Nissila, T ;

Ferrando, R ;

Ying, SC .

ADVANCES IN PHYSICS, 2002, 51 (03) :949-1078

[2]

[Anonymous], 1970, QUANTUM MECH

[3]

Arrhenius S., 1889, Z. Phys. Chem., V4U, P226, DOI DOI 10.1515/ZPCH-1889-0416

[4] SURFACE STUDIES BY SCANNING TUNNELING MICROSCOPY [J].

BINNING, G ;

ROHRER, H ;

GERBER, C ;

WEIBEL, E .

PHYSICAL REVIEW LETTERS, 1982, 49 (01) :57-61

[5] Nature, strength, and consequences of indirect adsorbate interactions on metals [J].

Bogicevic, A ;

Ovesson, S ;

Hyldgaard, P ;

Lundqvist, BI ;

Brune, H ;

Jennison, DR .

PHYSICAL REVIEW LETTERS, 2000, 85 (09) :1910-1913

[6] Self-diffusion of adatoms, dimers, and vacancies on Cu(100) [J].

Boisvert, G ;

Lewis, LJ .

PHYSICAL REVIEW B, 1997, 56 (12) :7643-7655

[7] MIGRATION OF CU ADATOMS ON A CU(100) SURFACE, STUDIED WITH LOW-ENERGY ION-SCATTERING (LEIS) [J].

BREEMAN, M ;

BOERMA, DO .

SURFACE SCIENCE, 1992, 269 :224-228

[8] Mechanisms of exchange diffusion on fcc(111) transition metal surfaces [J].

Bulou, H ;

Massobrio, C .

PHYSICAL REVIEW B, 2005, 72 (20)

[9] Long range substrate mediated mass transport on metal surfaces induced by adatom clusters [J].

Bulou, H ;

Bucher, JP .

PHYSICAL REVIEW LETTERS, 2006, 96 (07)

[10] Local strain analysis of the herringbone reconstruction of Au(111) through atomistic simulations [J].

Bulou, H ;

Goyhenex, C .

PHYSICAL REVIEW B, 2002, 65 (04) :1-10

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