A photoelectron spectrometer for k-space mapping above the Fermi level

Greber, Thomas; Raetzo, O.; Kreutz, T. J.; Schwaller, P.; Deichmann, W.; Wetli, E.; Osterwalder, Jürg

doi:10.1063/1.1148429

Cited by 117 publications

(93 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A conventional hemispherical analyzer using a channeltron detector typically needs to sample several thousand points on the hemisphere, which translates into several thousand angle settings of the sample manipulator [7]. As an alternative route, parallel detection techniques were developed in the past.…”

Section: Introductionmentioning

confidence: 99%

Acquisition of photoelectron diffraction patterns with a two-dimensional wide-angle electron analyzer

Greif

Castiglioni

Becker‐Koch

et al. 2014

Journal of Electron Spectroscopy and Related Phenomena

View full text Add to dashboard Cite

An efficient and fast way to measure photoelectron diffraction data over the full 2 angular range with high data point density is presented, taking advantage of the massive parallel detection capabilities of modern two-dimensional electron detectors. We introduce generic routines for data binning and for the mapping of the detector signal onto emission angles. X-ray photoelectron diffraction patterns taken from Bi(1 1 1) with the new detection scheme are compared to data sets taken with a conventional hemispherical analyzer equipped with a channeltron detector. As a result, the data acquisition time can be reduced by roughly a factor of ten while obtaining comparable if not superior data quality. The sampling technique is extended to UV-excited angle-resolved photoelectron spectroscopy as illustrated by a mapping of the Fermi surface of Cu (1 1 1 AbstractAn efficient and fast way to measure photoelectron diffraction data over the full 2π angular range with high data point density is presented, taking advantage of the massive parallel detection capabilities of modern two-dimensional electron detectors. We introduce generic routines for data binning and for the mapping of the detector signal onto emission angles. X-ray photoelectron diffraction patterns taken from Bi(111) with the new detection scheme are compared to data sets taken with a conventional hemispherical analyzer equipped with a channeltron detector. As a result, the data acquisition time can be reduced by roughly a factor of ten while obtaining comparable if not superior data quality.The sampling technique is extended to uv-excited angle-resolved photoelectron spectroscopy as illustrated by a mapping of the Fermi surface of Cu(111).

show abstract

Section: Introductionmentioning

confidence: 99%

Acquisition of photoelectron diffraction patterns with a two-dimensional wide-angle electron analyzer

Greif

Castiglioni

Becker‐Koch

et al. 2014

Journal of Electron Spectroscopy and Related Phenomena

View full text Add to dashboard Cite

show abstract

“…3b, inset substrate of only -0.6%. Along the [1][2][3][4][5][6][7][8][9][10] direction, the lattice mismatch is M [1][2][3][4][5][6][7][8][9][10] = -2.6%. The super- (Fig.…”

mentioning

confidence: 99%

“…This surface has a centered rectangular structure that is nearly but not quite hexagonal, and should thus be an interesting template for growing hexagonal boron nitride layers. It is anisotropic with lattice spacings of 3.15 Å ([001] direction), 4.45 Å ( [1][2][3][4][5][6][7][8][9][10]) and 2.64 Å ( [1][2][3][4][5][6][7][8][9][10][11]). This property reflects itself in the 1D character of the arising structures: depending on the temperature of the sample during preparation, a striped h-BN phase, a boron nanowire (BNW) phase, or a coexistence of the two are observed.…”

mentioning

confidence: 99%

“…It consists of a single h-BN layer and exhibits a 4 · 1 superstructure of the Mo(110) surface lattice. Note: We refer here to the centered rectangular lattice; the superstructure consists thus of a new periodicity of four times the Mo(110) lattice spacing along [001] and one time along [1][2][3][4][5][6][7][8][9][10] (Fig. 1 shows a model).…”

mentioning

confidence: 99%

“…[10]) equipped with instrumentation for ultra-violet photoelectron spectroscopy (UPS), angle-resolved photoelectron spectroscopy (ARPES), X-ray photoelectron spectroscopy (XPS), X-ray photoelectron diffraction (XPD), lowenergy electron diffraction (LEED) and scanning tunneling microscopy (STM). The data shown in the figures were recorded at room temperature.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Tunable self-assembly of one-dimensional nanostructures with orthogonal directions

et al. 2007

View full text Add to dashboard Cite

High-temperature exposure of a Mo(110) surface to borazine (HBNH) 3 leads to the formation of two distinctly different self-assembling nanostructures. Depending on the substrate temperature during preparation, either well-aligned, ultra-thin boron nanowires or a single-layer stripe structure of hexagonal boron nitride forms. Both structures show one-dimensional (1D) characteristics, but in directions perpendicular to each other. It is also possible to grow the two phases in coexistence. The relative weights are controlled by the sample temperature during preparation.Keywords Hexagonal boron nitride (h-BN) Á Boron Á One-dimensional nanostructures Á Nanowire Á Photoemission Á Scanning tunneling microscopy (STM) Á Low energy electron diffraction (LEED)In nanoscience and nanotechnology, there is an ubiquitous need for arranging nanometer-sized objects on surfaces in an orderly way. The atomic lattices of stable inorganic materials are usually too narrowly spaced for such applications, and research has focused on surfacesuperstructures with periodicities in the one to a few nanometer range, which can serve as templates e.g., for the formation of ordered layers of well-separated molecules, or for the growth of ordered metallic deposits and monodisperse metallic clusters [1]. Onedimensional (1D) superstructures represent an important class of templates, with confining potentials for electrons, molecules or metallic adsorbates along one direction parallel to the surface. Examples for 1D superstructures on surfaces include vicinal surfaces [2,3] submonolayer oxygen adsorbate structures on Cu(110) [4] or submonolayer structures of larger molecules organized into stripes by long-range, substrate-mediated interaction [5]. However, these 1D templates are often not very stable and not well ordered on a micrometer scale.Monolayer structures of hexagonal boron nitride (h-BN) on transition metal surfaces have received much interest recently. On Ni(111), which has a lattice spacing that is nearly equal to that of h-BN (2.49 Å for nickel, 2.50 Å for h-BN), the chemical vapor deposition (CVD) of benzene-like borazine (HBNH) 3 at 1050 K leads to very uniform epitaxial monolayers [6]. On Rh(111) the large lattice mismatch causes the h-BN to form a highly ordered mesh-like nanostructure with a periodicity of about 3 nm: the nanomesh [7]. On Pd(110) and Pd(111), where the lattice mismatch is even larger, continuous single-layer films are observed that exhibit a variety of moiré patterns [8,9]. A common aspect of these boron nitride layers is that, as a result of the high preparation temperatures, they represent chemically inert and highly temperatureresistant nanotemplates for the production of ordered molecular films or monodisperse metal clusters. It would thus be desirable to have also 1D templates based on this material.In this letter, we report two new self-assembling nanostructures grown by high-temperature CVD of borazine on the (110) surface of bcc molybdenum. This surface has a centered rectangular structure that is n...

show abstract

Electron Based Methods: 3.2.2 Photoelectron Spectroscopy and Diffraction

Osterwalder

2013

Surface and Interface Science

View full text Add to dashboard Cite

A photoelectron spectrometer for k-space mapping above the Fermi level

Cited by 117 publications

References 12 publications

Acquisition of photoelectron diffraction patterns with a two-dimensional wide-angle electron analyzer

Acquisition of photoelectron diffraction patterns with a two-dimensional wide-angle electron analyzer

Tunable self-assembly of one-dimensional nanostructures with orthogonal directions

Electron Based Methods: 3.2.2 Photoelectron Spectroscopy and Diffraction

Contact Info

Product

Resources

About