Electron Energy Loss Spectra for Evaporated Carbon Films

Burge, R. E.; Misell, D L

doi:10.1080/00318086.1968.11716228

Cited by 66 publications

(19 citation statements)

References 17 publications

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“…Of course, for this to work, multiple-scattering effects ͑in particular additional valence losses͒ must first be removed and this is done using a Fourier-ratio deconvolution. 39,40 If the spectra are further scaled to that of the LAPW calculated DOS for Ni 3 Al ͑Ref. 16͒ ͑which is in good agreement with the EELS spectrum of bulk Ni 3 Al) then the energy differences can be determined in eV/Ni atom.…”

Section: Quantitative Tests Of the Tight-binding/eels Sum Rulementioning

confidence: 94%

Simple model for relating EELS and XAS spectra of metals to changes in cohesive energy

Muller

1998

Phys. Rev. B

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An explicit connection between the unoccupied single-particle states which are measured with electron energy loss or x-ray-absorption spectroscopy ͑EELS or XAS͒ and the occupied states which are involved in bonding is established by applying the force theorem to the tight-binding bond model. The resulting sum rule relates the first moment of the EELS spectrum to the single-particle bond energy. The sum rule connects a local EELS measurement with a local change in cohesion, thus treating the energetics of defects and nonperiodic structures on an equal footing with perfect crystals. As an example, the sum rule is used to estimate the cohesion of a grain boundary in Ni 3 Al from experimental EELS spectra. It should also prove useful for qualitative interpretations of EELS spectra in other metal alloys.

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Section: Quantitative Tests Of the Tight-binding/eels Sum Rulementioning

confidence: 94%

Simple model for relating EELS and XAS spectra of metals to changes in cohesive energy

Muller

1998

Phys. Rev. B

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“…4͒, and is readily corrected by deconvolution. 64 The different energy dependencies of the EELS and XAS cross sections make the two techniques very complementary. The rapid decrease in the EELS cross section with energy makes it very difficult to perform measurements at more than a few keV, an energy range where x-ray measurements become more practical.…”

Section: ͑7͒mentioning

confidence: 99%

“…As the scattering events are independent and follow a Poisson distribution, they can be deconvolved using the Fourier ratio method, 64,71 which was performed using a Wiener filter. 72 The Wiener deconvolution also corrects some of the differences in detector response and makes possible a comparison of spectra recorded from films of differing thicknesses.…”

Section: Recording and Processing Of Spectramentioning

confidence: 99%

Connections between the electron-energy-loss spectra, the local electronic structure, and the physical properties of a material: A study of nickel aluminum alloys

1998

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The local electronic structure of a material can be determined from the energy-loss spectrum of a swift electron beam scattered through it. When the electron beam is focused down to the width of an atomic column, the electronic density of states ͑DOS͒ at an interface, grain boundary, or impurity site can be decomposed by site, chemical species and angular momentum. Here we discuss the use of electron-energy-loss spectroscopy ͑EELS͒ fine structure to provide insight into the origin of grain boundary and interfacial properties reported earlier ͓D. A. Muller et al., Phys. Rev. Lett. 75, 4744 ͑1995͔͒ for Ni 3 Al. We examine the electronic structure trends in Ni-Al compounds, both experimentally with the EELS measurements and theoretically, using ab initio band-structure calculations. The conditions under which the band-structure calculations can quantitatively reproduce the EELS measurements ͑and in particular, the question of just which local DOS is being measured͒ are addressed. Cyrot-Lackmann's moments theorem provides a framework to explain the systematic changes in the local DOS on alloying. The shape changes in the near-edge fine structure of both the Ni and Al L edges are readily understood by the sensitivity of the fourth moment of the local DOS to the angular character of the Ni-Al bonding. The language of bond-order potentials proved useful in linking shape changes in the DOS to changes in cohesion. The consequences for formation energies and ordering trends in the transition-metal-aluminum alloys are also discussed.

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“…(4.11) with the finite angular resolution obtainable in an experiment. The effects on (dσ i /dΩ) A and (dσ i /dΩ) BP of the inclusion of the experimentally measured f(E) for carbon (Burge & Misell, 1968) are shown in Figure 39 for 100-kev electrons and both the free atom and plasma oscillation theories.…”

Section: P1245mentioning

confidence: 98%

“…Smart, University of London, "Studies of small angle electron scattering in an electron microscope". Misell and Burge (1968) followed the approach of Wentzel (1927) that treated each scattering event independently. p1295 Bothe and Wentzel make different approaches to the same problem.…”

Section: P1290mentioning

confidence: 99%

Imaging with Electrons, X-rays, and Microwaves

Burge

2015

Advances in Imaging and Electron Physics

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Electron Energy Loss Spectra for Evaporated Carbon Films

Cited by 66 publications

References 17 publications

Simple model for relating EELS and XAS spectra of metals to changes in cohesive energy

Simple model for relating EELS and XAS spectra of metals to changes in cohesive energy

Connections between the electron-energy-loss spectra, the local electronic structure, and the physical properties of a material: A study of nickel aluminum alloys

Imaging with Electrons, X-rays, and Microwaves

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