Experimental determination of the vibrations and diffusion of isolated CO molecules moving parallel to a Pt(111) surface

被引：33

作者：

Graham, AP ^{[1
]}

Toennies, JP ^{[1
]}

机构：

[1] Max Planck Inst Stromungsforsch, D-37073 Gottingen, Germany

来源：

EUROPHYSICS LETTERS | 1998年 / 42卷 / 04期

关键词：

D O I：

10.1209/epl/i1998-00270-x

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The full-width half-maxima (FWHM) of the 6 meV parallel frustrated translation mode of CO chemisorbed on Pt(lll) (E-ads = 1.5 eV) have been measured using high-resolution helium atom scattering over the temperature range 50-200 K for four different isotopomers and the results are compared with earlier measurements on CO/Cu(001), which has a much lower adsorption energy of 0.7 eV. The FWHM is independent of the temperature and isotopomer and corresponds to a vibrational lifetime of 1.37+/-0.22 s. The observed lifetime is attributed to both phononic and electronic frictional damping and is used, in conjunction with quasi-elastic helium scattering measurements, to estimate the diffusion barrier to be E-barr similar to 130 meV.

引用

页码：449 / 454

页数：6

共 25 条

[1]

Bagus P. S., COMMUNICATION

[2] Quasielastic helium atom scattering measurements of microscopic diffusion of CO on the Ni(110) surface [J].

Bertino, MF ;

Hofmann, F ;

Steinhogl, W ;

Toennies, JP .

JOURNAL OF CHEMICAL PHYSICS, 1996, 105 (24) :11297-11304

[3] DIFFUSION AND VIBRATION OF ADATOMS ON A SOLID-SURFACE [J].

CHEN, LY ;

YING, SC .

PHYSICAL REVIEW LETTERS, 1993, 71 (26) :4361-4364

[4] MOLECULAR-ORIGINS OF FRICTION - THE FORCE ON ADSORBED LAYERS [J].

CIEPLAK, M ;

SMITH, ED ;

ROBBINS, MO .

SCIENCE, 1994, 265 (5176) :1209-1212

[5] A MOLECULAR-DYNAMICS SIMULATION OF THE DIFFUSION OF SODIUM ON A CU(001) SURFACE [J].

ELLIS, J ;

TOENNIES, JP .

SURFACE SCIENCE, 1994, 317 (1-2) :99-108

[6] HELIUM ATOM SCATTERING STUDY OF THE FRUSTRATED TRANSLATION MODE OF CO ADSORBED ON THE CU(001) SURFACE [J].

ELLIS, J ;

TOENNIES, JP ;

WITTE, G .

JOURNAL OF CHEMICAL PHYSICS, 1995, 102 (12) :5059-5070

[7] SURFACE-DIFFUSION OF CO ON PT(111) - A HREELS STUDY AT HIGH-TEMPERATURES [J].

FROITZHEIM, H ;

SCHULZE, M .

SURFACE SCIENCE, 1994, 320 (1-2) :85-92

[8] DIFFUSION OF ADSORBATES ON METAL-SURFACES [J].

GOMER, R .

REPORTS ON PROGRESS IN PHYSICS, 1990, 53 (07) :917-1002

[9] Observation of the broadening and shift of the frustrated translation vibrational mode of CO on Cu(001) by high resolution helium atom scattering [J].

Graham, A ;

Hofmann, F ;

Toennies, JP .

JOURNAL OF CHEMICAL PHYSICS, 1996, 104 (13) :5311-5316

[10]

GRAHAM A, IN PRESS J CHEM PHYS

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