Mise au point d'une nouvelle méthode d'analyse quantitative des spectres de pertes d'énergie d'électrons rapides diffusés dans la direction du faisceau incident : application à l'étude des métaux nobles

Wehenkel, C.

doi:10.1051/jphys:01975003602019900

Cited by 78 publications

(22 citation statements)

References 17 publications

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“…The fact that the adsorption of oxygen also decreased the loss at 18.8 eV, similarly as in the adsorption of CO at low temperature [28], may support the idea of Wehenkel [35] that, in contrast to the former interpretation [30,33,34], the losses below 3.5 eV are largely of a hybrid character, conta~~g both a surface and a bulk contribution; the surface contribution is stronger below 10 eV. A new loss appeared at 9.3 eV, which may confirm the interpretation of Kessler and Thieme [ 131 for the origin of the 10 eV loss in their spectra.…”

Section: Electron Energy Loss Specfrasupporting

confidence: 65%

Adsorption and decomposition of HNCO on Cu(111) surface studied by Auger electron, electron energy loss and thermal desorption spectroscopy

Solymosi¹,

Kiss²

1981

Surface Science Letters

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No detectable adsorbed species were observed after exposure of HNCO to a clean Cu(ll1) surface at 300 K. The presence of adsorbed oxygen, however, exerted a dramatic influence on the adsorptive properties of this surface and caused the dissociative adsorption of HNCO with concomitant release of water. The adsorption of HNCO at 300 K produced two new strong losses at 10.4 and 13.5 eV in electron energy loss spectra, which were not observed during the adsorption of either CO or atomic N. These loses can be attributed to surface NC0 on Cu( 111). The surface isocyanate was stable up to 400 K. The decomposition in the adsorbed phase began with the evolution of COz. The desorption of nitrogen started at 700 K. Above 800 K, the formation of CzNz was observed. The characteristics of the CO, formation and the ratios of the products sensitively depended on the amount of preadsorbed oxygen. No HNCO was desorbed as such, and neither NC0 nor (NCO)? were detected during the desorption. From the comparison of adsorption and desorption behaviours of HNCO, N, CO and CO2 on copper surfaces it was concluded that NC0 exists as such on a Cu(ll1) surface at 300 K. The interaction of HNCO with oxygen covered Cu(ll1) surface and the reactions of surface NC0 with adsorbed oxygen are discussed in detail.

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Section: Electron Energy Loss Specfrasupporting

confidence: 65%

Adsorption and decomposition of HNCO on Cu(111) surface studied by Auger electron, electron energy loss and thermal desorption spectroscopy

Solymosi¹,

Kiss²

1981

Surface Science Letters

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“…et al [19,20] plane wave model [24] orthogonalized plane wave [25] extrapolation optical data model by Ashley [21] of optical data Penn model [22] (9) and (2) for silver. Optical data for the bulk have been taken from [29]; the contribution of the N 2,3 core electrons has been substracted.…”

Section: Excitation Of Surface Plasmonsmentioning

confidence: 99%

“…6 the corresponding functions of volume and surface losses are shown for Ag. The basic volume losses have been taken from [29].…”

Section: Excitation Of Surface Plasmonsmentioning

confidence: 99%

Monte-Carlo Simulation of Low Energy Electron Scattering in Solids

Kuhr

Fitting

1999

phys. stat. sol. (a)

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A new Monte‐Carlo program for simulation of low energy electron scattering in solids is presented. Applications to electron microscopy and electron microprobe analysis are discussed. Elastic interactions are described by Mott cross sections within the framework of partial wave analysis (PWA) whereas the inelastic collisions are based upon the momentum dependent dynamic form factor S(q, ω). For inelastic interactions with weakly bound valence electrons, S(q, ω) is expressed in terms of the energy loss function Im {—/1ε(q, ω)} of the linear dielectric theory. On the other hand, generalized oscillator strengths (GOS) are chosen in case of excitation of tightly bound core level electrons. The electron energy range extends from several keV down to energies of about 10 eV, i.e. just above the vacuum level. Secondary electron (SE) creation and cascade processes have been included, where the SE transport has been treated in the same way as the scattering of the primary electrons.

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“…We present in Figure 3 the ELF of Au computed from optical measurements (Palik 1990). Also presented is the ELF computed with the ELS of Wehenkel (1975) combined with x-ray MAC for energies > 200 eV. Clearly, good agreement is found between the ELF computed from the x-ray MAC and the optical measurements.…”

Section: Determination Of the Stopping Power From Optical Measurementsmentioning

confidence: 79%

“…For outputs, two files are created: an ASCII file which contains, in order, the energy, Z eff (E), J eff (E), the resulting stop- (Palik 1990) and the energy loss spectrum (ELS) of Wehenkel (1975). For ELS computation and for an energy > 200 eV the x-ray MAC was used.…”

Section: Description Of the Stoppingc Programmentioning

confidence: 99%

CASINO: A new monte Carlo code in C language for electron beam interactions—part III: Stopping power at low energies

et al. 1997

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This paper is a description of the stopping power routine utilized in the CASINO program that is based on the experimental measurement of the energy loss function (ELF). In addition, we present an ANSI C standard program that can be used to generate the data needed for the stopping power routine. Both optical and energy loss spectrum (ELS) measurements of the ELF can be used as input to compute the stopping power. For ELS, only the single scattering spectrum is needed. Hence, measurement of the stopping power for a given element or compound of interest can easily be performed and used in the CASINO program. The resulting effect of using these stopping powers in Monte Carlo simulations is generally to increase the backscattering coefficient. Except for carbon, the change of stopping power for pure elements so far compiled is relatively small. In some compounds (i.e., Al 2 O 3 and ZnSe), the discrepancy with the Joy and Luo (1989) expression is significant.

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Mise au point d'une nouvelle méthode d'analyse quantitative des spectres de pertes d'énergie d'électrons rapides diffusés dans la direction du faisceau incident : application à l'étude des métaux nobles

Cited by 78 publications

References 17 publications

Adsorption and decomposition of HNCO on Cu(111) surface studied by Auger electron, electron energy loss and thermal desorption spectroscopy

Adsorption and decomposition of HNCO on Cu(111) surface studied by Auger electron, electron energy loss and thermal desorption spectroscopy

Monte-Carlo Simulation of Low Energy Electron Scattering in Solids

CASINO: A new monte Carlo code in C language for electron beam interactions—part III: Stopping power at low energies

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