LEED intensities — Experimental progress and new possibilities of surface structure determination

Heinz, K.; Müller, K.

doi:10.1007/bfb0041341

Cited by 31 publications

(2 citation statements)

References 88 publications

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“…The observed maps of FIDs in Figure 2b for neon and in Figure 3b for helium show that the FWHM of the FID intensity profile across the step edge atom of a W(112) facet is about 280 pm in the former case and about 304 pm in the latter case, respectively. These results are almost the same as the value of 280 pm FWHM obtained from the helium field ionization intensity profile measurement for a single tungsten atom on a W(100) plane at 63 K (Witt & Müller, 1986b) by means of a sensitive video system combined with a channel electron multiplier array (Heinz & Müller, 1982). Note here that the value of 280 pm FWHM obtained from the above-mentioned video system is the result after the treatment of deconvolution process for the thermal broadening effect on a spot size blurring, and the measurement temperature is lower than the present study.…”

Section: Characteristics Of Fids In Neon and Helium Field Adsorption ...supporting

confidence: 82%

Comparative Studies on Local Barrier Field Variations Above Field-Adsorbed Helium and Neon with a Micro-Probe Hole Field Ion Microscope

Ohta

Kobayashi

2022

Microscopy and Microanalysis

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The local field ion emission properties of helium and neon around a step edge atom of W(112) were examined at liquid nitrogen temperature using a micro-probe hole field ion microscope combined with a pulse-counting analysis. We have analyzed the mapped field ion densities obtained for both imaging gas atoms at their respective best local image voltages based on the formula for tunneling barrier strength and have evaluated the dipole moment of polarized adatom as well as the local field enhancement factor at the adatom site. We found that the dipole moments of helium and neon adatoms showed the same value, although the best local image field acting on the helium adatom is much higher than that on the neon adatom. We also found the same magnitude of local field enhancement factors for both noble gas field adsorptions. These results imply that the key to the best local image condition is the tunneling barrier field variations above the adatom. The vital role of the imaging gas atoms is to form an optimum dipole moment to create an ideal electric field distribution for the best local image appearance at each atom site depending on the different chemical nature of adatom species.

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Section: Characteristics Of Fids In Neon and Helium Field Adsorption ...supporting

confidence: 82%

Comparative Studies on Local Barrier Field Variations Above Field-Adsorbed Helium and Neon with a Micro-Probe Hole Field Ion Microscope

Ohta

Kobayashi

2022

Microscopy and Microanalysis

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“…Les processus de diffusion multiple à considérer sont ceux mettant en jeu les atomes qui le composent. Ce problème de diffusion d'électrons par une substance amorphe a été abondamment étudié [8] et nous ne le traiterons pas ici. Par contre nous nous inspirerons de ce travail pour calculer la matrice de transition de la couche adsorbee.…”

Section: Amplitude De Diffusion De Ladsorbaiunclassified

Caracterisation de l'ordre par diffraction d'electrons

et al. 1993

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CHARACTERIZATION OF THE ORDER BY ELECTRON DIFFRAC-TION:In the case of a solid with a local atomic ordér, we can consider only a statistical description of atomic positions. For a homogeneous phase, this description is given by the two-site occupancy correlation function, the three-site occupancy correlation function, ... etc. The local atomic order is investigated by experiments in which the solid is bombarded with a wełl-collimated monoenergetic beam of particles (here electrons). Starting from a model describing the force law between an electron and an atomic scatterer and from a model of the solid describing the distribution of atoms in space, a computation of elastically backscattered intensities can be carried out. The latter depends on geometrical parameters which are determined in such a way that one gets the best agreement between the results of calcułation and the measurements. This work aims to provide the way of proceeding to calculate the diffuse intensity. The main difficulty in this task appears when we undertake to treat the problem of multiple scattering. We provide here a detailed description of a calculation corresponding to the case of the backscattering of ełectrons at a single crystal surface covered with a partially disordered atomic layer. Assuming that the coverage in adatoms is small and these adatoms are weak scatterers, we can neglect the mułtiple scattering events inside the layer. This simplifying assumption leads to an expression of the diffuse intensity in terms of: the Fourier transform on the 2D surface lattice of the pair correlation function; the renormalized transition matrices of the different kinds of adatoms.

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Diffraction and EXAFS

Niemantsverdriet

2000

Spectroscopy in Catalysis

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LEED intensities — Experimental progress and new possibilities of surface structure determination

Cited by 31 publications

References 88 publications

Comparative Studies on Local Barrier Field Variations Above Field-Adsorbed Helium and Neon with a Micro-Probe Hole Field Ion Microscope

Comparative Studies on Local Barrier Field Variations Above Field-Adsorbed Helium and Neon with a Micro-Probe Hole Field Ion Microscope

Caracterisation de l'ordre par diffraction d'electrons

Diffraction and EXAFS

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