LEED analysis of a dense lead monolayer on copper (100)

Hösler, W.; Moritz, Wolfgang

doi:10.1016/0039-6028(86)90084-1

Cited by 51 publications

(15 citation statements)

References 22 publications

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“…ld-Top view schematic of the literature model for the c(5d2x~2)R45°surface [7]. including the steps at the edge of the central terrace.…”

Section: Resultsmentioning

confidence: 99%

“…In this conversion the addition of one more Pb atom to the c(4x4) unit cell, plus the rearrangement of two of the Pb atoms already there, leads to the removal of the remaining four Cu atoms. Further Pb deposition causes the c(2x2) overlayer to disorder through the introduction of surface dislocation lines [4,7,14], resulting in initial splitting of the 2x2 spots and, eventually, a diffuse (1x1) LEED pattern. Near 0.6 ML a third ordered overlayer structure appears, with a c(5~2x~2)R45" diffraction pattern.…”

Section: Background On the Pb/cu(100) Systemmentioning

confidence: 99%

“…overlayer [7]. Pb atoms still reside in the four-fold hollows, but the structure is compressed to allow for the extra coverage of Pb atoms (Fig.…”

Section: Background On the Pb/cu(100) Systemmentioning

confidence: 99%

“…Previous investigations by low energy electron diffraction (LEED) [1][2][3][4][5][6][7][8][9][10], He atom scattering [11][12][13], scanning tunneling microscopy (STM) [14,15] and Rutherford backscattering [16] have established that Pb grows on CU(1OO) in a prototypical StranskiKrastanov mode with three well-defined ordered structures at submonolayer coverages.…”

Section: Introductionmentioning

confidence: 99%

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Surface morphology changes during Pb deposition on Cu(100): evidence for surface alloyed Cu(100)–c(2×2) Pb

Plass

Kellogg

2000

Surface Science

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e describe the rnicrofabrication of a multi-level diffractive optical element (DOE) onto a micro-electromechanical system (MEMS) as a key element in an integrated compact optical-MEMS laser scanner. The DOE is a four-level off-axis microlens fabricated onto a movable polysilicon shuttle. The microlens is patterned by electron beam lithography and etched by reactive ion beam etching. The DOE was fabricated on two generations of MEMS components. The first generation design uses a shuttle suspended on springs and displaced by a linear rack. The second generation design uses a shuttle guided by roller bearings and driven by a single reciprocating gear. Both the linear rack and the reciprocating gear are driven by a microengine assembly. The compact design is based on mounting the MEMS module and a vertical cavity surface emitting laser (VCSEL) onto a fused silica substrate that contains the rest of the optical system. The estimated scan range of the system is &4°with a spot size of 0.5 mm. INTRODUCTIONMicro-electromechanical systems (MEMS) is a primarily silicon-based technology that brings precision motion to the microscopic scale using batch fabrication processes developed as extensions from the silicon integrated circuit industry. Compared to the macroscopic systems whose functions they emulate, MEMS are smaller, lighter, lower cost, and more efficient (lower power consumption). For many applications, it is desirable to incorporate optical functions with MEMS. This requires a hybrid approach to integrate compound semiconductor-based light emitters and some form of rnicrooptics, e.g., diffractive optical elements (DOES), to create an integrated microsystem.Integrated Microsystems is an emerging technology in which electrical, optical, and mechanical functions are combined at the chip level into compact, lightweight, and [ultimately] low cost modules with performance equal to or even exceeding those of conventional macroscopic systems. The development of integrated rnicrosystems is expected to revolutionize abroad range of fields, extending beyond electro/optomechanical systems to the fields of biology, chemistry and medicine. Just as the integrated circuit combines formerly discrete devices (transistors, resistors, capacitors) onto a single chip with increasing functionality at DISCLAIMERPortions of this document may be illegible in electronic image products.Images are produced from the best available original document. AbstractUsing Low Energy Electron Microscopy (LEEM), we have followed Cu(l 00) surface morphology changes during Pb deposition at different temperatures. Surface steps advance and 2-D islands nucleate and grow as deposited Pb first alloys, and then dealloys, on a 125°C CU(1OO) surface. From LEEM images, we determine how much Cu is being displaced at each stage and find that the amount of material added to the top layer for a complete Pb/Cu(100) c(4x4) reconstruction (a surface alloy) is consistent with the expected c(4x4) Cu content of 0.5 monolayer. However, as the surface changes to the Pb/Cu...

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“…ld-Top view schematic of the literature model for the c(5d2x~2)R45°surface [7]. including the steps at the edge of the central terrace.…”

Section: Resultsmentioning

confidence: 99%

Section: Background On the Pb/cu(100) Systemmentioning

confidence: 99%

“…overlayer [7]. Pb atoms still reside in the four-fold hollows, but the structure is compressed to allow for the extra coverage of Pb atoms (Fig.…”

Section: Background On the Pb/cu(100) Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Surface morphology changes during Pb deposition on Cu(100): evidence for surface alloyed Cu(100)–c(2×2) Pb

Plass

Kellogg

2000

Surface Science

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“…The surface structures belong to the 'ladder' or antiphase domain structural family, i.e. c(n √ 2 × √ 2)R45 • (n = 9, 7, 5 as coverage increases), which have been widely observed on a variety of thin films grown on (001) substrates, including Li/Ni(001) [27] and Pb/Cu(001) [28][29][30]. They contrast with the close-packed, incommensurate hexagonal overlayers formed by the heavier alkali metal systems K/Cu(001) [31,32] and Cs/Cu(001) [33] and indicate a relatively strong adsorbatesubstrate interaction.…”

Section: Epitaxial Growth and Surface Morphologiesmentioning

confidence: 99%

Physical Origins of Fine Structure in the Resonant Tunneling through Laterally Confined 1D-0D-1D Structures

Csontos¹,

Xu²

2001

Jpn. J. Appl. Phys.

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We use helium atom scattering to investigate the structures formed by Li adsorption onto Cu(001) in the 0-2 ML regime. Submonolayer growth at 180 K proceeds through a sequence of ordered overlayers, including a c(2 × 2) structure at 0.5 ML and a series of 'ladder' superlattices around 0.6 ML. Beyond 1 ML, incommensurate, three-dimensional Li islands develop. A quantum close-coupled scattering analysis is performed to study the empirical He-surface potential of the structurally heterogeneous ladder structures. Good agreement with the measured distribution of diffracted intensity is obtained by describing the He-ladder interaction potential as the summation of only six one-dimensional Fourier components. The fitted potential indicates a remarkably flat surface that is punctuated by substantial, striped protrusions in the electron density. The result is consistent with the formation of one-dimensional Li wires, indicating an inhomogeneous metallization process.

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Antiphase Domain Boundary Formation in 2D Ba–Ti–O on Pd(111): An Alternative to Phase Separation

Wührl

Krahn

Schenk

et al. 2021

Physica Status Solidi (b)

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2D oxide quasicrystals (OQCs) are unique structures arising from atoms positioned at the vertices of a dodecagonal triangle–square–rhombus tiling. The prototypical example for OQCs is derived from BaTiO3 on Pt(111). Herein, scanning tunneling microscopy (STM) and low‐energy electron diffraction (LEED) investigations of 2D oxide layers derived from BaTiO3 on Pd(111) are reported. Upon ultrahigh vacuum (UHV) annealing, different long‐range ordered structures are observed with a base of four vertex atoms forming two edge‐sharing equilateral triangles. By a periodic repetition of this base in either quadratic or rectangular unit cells, a triangle–square tiling (known as σ‐phase approximant or 32.4.3.4 Archimedean tiling) or a triangle–rhombus tiling is formed. Both structures vary strongly in their vertex density. In addition, the formation of antiphase domain boundaries in the σ phase is observed resulting in a well‐ordered incorporation of rhombuses in the triangle–square tiling. A systematic variation of the frequency of these domain boundaries is identified as a mechanism for an incremental increase in the global vertex density, mediating between pure triangle–square and triangle–square–rhombus tilings.

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LEED analysis of a dense lead monolayer on copper (100)

Cited by 51 publications

References 22 publications

Surface morphology changes during Pb deposition on Cu(100): evidence for surface alloyed Cu(100)–c(2×2) Pb

Surface morphology changes during Pb deposition on Cu(100): evidence for surface alloyed Cu(100)–c(2×2) Pb

Physical Origins of Fine Structure in the Resonant Tunneling through Laterally Confined 1D-0D-1D Structures

Antiphase Domain Boundary Formation in 2D Ba–Ti–O on Pd(111): An Alternative to Phase Separation

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