In situ scanning tunneling microscopy of adsorbates on electrode surfaces: images of the (.sqroot.3.times..sqroot.3)R30.degree.-iodine adlattice on platinum(111)

Yau, Shueh Lin; Vitus, Carissima M.; Schardt, Bruce C.

doi:10.1021/ja00165a073

Cited by 135 publications

(74 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Iodine on the Pt͑111͒ surface is known to form four different commensurate structures: ͑ ͱ 3 ϫ ͱ 3͒R30°with one atom per unit cell, ͑ ͱ 7 ϫ ͱ 7͒R19.11°w ith three atoms per unit cell, ͑3 ϫ 3͒ − sym and ͑3 ϫ 3͒ − asym with four atoms per unit cell. 16,40,41 The alkalis form wide variety of commensurate and incommensurate structures on the Ag͑111͒ surface. 14,42 Both systems possess several different high-order commensurate structures, which indicates the complexity of the Fourier expansion of the adsorbate-substrate interaction potential.…”

Section: Comparison With Real Experimental Systemsmentioning

confidence: 99%

Analytic theory of hexagonal monolayer interacting with hexagonal substrate

Tkatchenko

2006

Phys. Rev. B

View full text Add to dashboard Cite

Analytic theory of the infinite rigid hexagonal monolayer interacting with hexagonal substrate is developed. The interaction potential is described by a Fourier series with up to six shells of the reciprocal cell vectors. It is rigorously shown that energy of minimum structures is directly related to their symmetry, assuming a decaying behavior of Fourier coefficients. Preliminary comparison with real systems of halogens and alkalis adsorbed on metal surfaces is encouraging and indicates that the adsorbate-substrate interaction is one of the main driving forces in the monolayer formation. The need of detailed ab initio calculations to obtain the Fourier coefficients for different complex adsorption systems is emphasized. Our results indicate the importance of accurate description of the adsorbate-substrate interactions for quantitative theory of monolayer epitaxy on well-ordered surfaces.

show abstract

Section: Comparison With Real Experimental Systemsmentioning

confidence: 99%

Analytic theory of hexagonal monolayer interacting with hexagonal substrate

Tkatchenko

2006

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…It is the so-called ͑3 ϫ 3͒-asym structure. [24][25][26][27][28][29][30][31][32][33][34][35][36][37]41,42 We believe that our model based on geometrical principles can also explain the appearance of this particular structure. Note that the arrangement of ͑3 ϫ 3͒-asym iodine adlayer on Pt(111) has been described in many papers, so far.…”

Section: Example Studymentioning

confidence: 99%

“…In case of ͑3 ϫ 3͒-asym, each threefold iodine atoms is surrounded by six neighboring adatoms positioned at a higher level. [24][25][26][27][28][29][30][31][32][33][34][35][36][37] In order to understand the conditions for appearance and differences between ͑3 ϫ 3͒-sym and ͑3 ϫ 3͒-asym structures we employ our model, looking for a full range of possible FIG. 4.…”

Section: Example Studymentioning

confidence: 99%

Unequal-sphere packing model for the structural arrangement of the well-ordered adsorbate-substrate system

Tkatchenko¹,

Batina²

2004

Phys. Rev. B

View full text Add to dashboard Cite

In order to understand the well-ordered adsorbate-substrate systems at atomic level, a method is developed based on the simulation of packing arrangements for layers of unequal spheres, in three-dimensional space. The model, based on geometrical principles, is developed for fcc structure consisting of two hexagonal ordered layers. During simulation, adsorbate spheres were accommodated in different positions, forming a great variety of structures, in dependence of the intersphere distance of the upper layer spheres. Using the average height of the adsorbate layer on the flat substrate as a determinant parameter, several specific structures have been selected as the most probable: ͑ͱ3 ϫ ͱ 3͒R30°, ͑ͱ7 ϫ ͱ 7͒R19.1°, and ͑3 ϫ 3͒. Indeed, they correspond to typical accommodations of the iodine adatoms on the Pt(111) surface, earlier found in experimental studies, which clearly supports the validity of our model. The model developed in our study could completely and satisfactorily describe the accommodation process of the iodine adlayer on the Pt (111) surface. This methodology could be of great help for interpretation of scanning tunneling microscopy images, better understanding of adlayer structures, and design of adsorbate-substrate systems with exciting properties.

show abstract

“…13 The c(p× 3)R30°transforms into the rot-hex arrangement at higher surface coverages. [14][15][16][17][18][19][20][21][22][23] Additional structural details of I-Au(111) were revealed by LEED and STM analysis. 24,25 STM shows the same iodine c(p× 3)R30°adlat-tices, which appear to be atomically flat.…”

Section: Introductionmentioning

confidence: 99%

Unequal-Sphere Packing Model for Simulation of the Uniaxially Compressed Iodine Adlayer on Au(111)

Tkatchenko

Batina

2005

J. Phys. Chem. B

View full text Add to dashboard Cite

A simple unequal-sphere packing (USP) model, based on pure geometrical principles, was applied to study the centered-rectangular iodine c(p× 3)R30°adlayer on the Au(111) surface, well-known from surface X-ray structure (SXS), low energy electron diffraction (LEED), and scanning tunneling microscopy (STM) experiments. To reproduce the exact patterns observed in experiments, two selective conditionssminimum average adsorbate height and minimum adlayer roughnessswere imposed. As a result, a series of adlayer patterns with c(p× 3)R30°symmetry (2.3 < p < 3), with precise structural details, including atomic registry and identification of the p-bisector as the most likely trajectory for the iodine adatom movement during the so-called uniaxial compression phenomenon, were identified. In addition, using the same model, the difference between the iodine adlayer arranged in hexagonal and centered-rectangular c(p× 3)R30°patterns, as in the case of Pt (111) and Au(111) surfaces, was investigated. Qualitative and quantitative comparison shows that iodine adatoms in these two arrangements differ significantly in atomic registry, distance from the substrate, and the adlayer corrugation. Our findings could be of special interest in the study of the nature of the iodine adatom bonding to different substrates (i.e., Au vs Pt).

show abstract

In situ scanning tunneling microscopy of adsorbates on electrode surfaces: images of the (.sqroot.3.times..sqroot.3)R30.degree.-iodine adlattice on platinum(111)

Cited by 135 publications

References 1 publication

Analytic theory of hexagonal monolayer interacting with hexagonal substrate

Analytic theory of hexagonal monolayer interacting with hexagonal substrate

Unequal-sphere packing model for the structural arrangement of the well-ordered adsorbate-substrate system

Unequal-Sphere Packing Model for Simulation of the Uniaxially Compressed Iodine Adlayer on Au(111)

Contact Info

Product

Resources

About