Development of New Apparatus for Electron–Polar‐Angle‐Resolved‐Ion Coincidence Spectroscopy and Auger–Photoelectron Coincidence Spectroscopy

Mase, Kenji; Kobayashi, Eiichi; Isari, Kouji

doi:10.1002/3527603425.ch16

Cited by 4 publications

(4 citation statements)

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“…From the Gaussian width of the Si 2p photoelectron peak fitted by a Voigt function, we estimated the electron kinetic energy resolution (E/ΔE, FWHM) of the CMA to be 21 in the kinetic energy range of 20 -150 eV. This value is poorer than that of the previous EICO analyzers mounted on a conflat flange with an outer diameter of 203 mm (E/ΔE = 80 -100) [12][13][14][15]28,35 and comparable to that of a previous miniature CMA mounted on a conflat flange with an outer diameter of 70 mm (E/ΔE = ∼20).…”

Section: Resultsmentioning

confidence: 60%

“…28,34 The ion desorption mechanisms that have been elucidated by EICO spectroscopy so far have been described in detail in previous papers. 12,13,15,28,35 All of the EICO analyzers developed so far, however, have been mounted on a conflat flange with an outer diameter of 203 mm. Because of the relatively large size, they have mainly been mounted on apparatus dedicated to coincidence spectroscopy.…”

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confidence: 99%

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Construction and Evaluation of a Miniature Electron Ion Coincidence Analyzer Mounted on a Conflat Flange with an Outer Diameter of 114 mm

et al. 2008

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Section: Resultsmentioning

confidence: 60%

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confidence: 99%

Construction and Evaluation of a Miniature Electron Ion Coincidence Analyzer Mounted on a Conflat Flange with an Outer Diameter of 114 mm

et al. 2008

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“…This, and recent instrumental developments by other groups, 37,40,45 are important steps in facilitating the wider application of APECS to complement other techniques and its use as a highly selective analytical technique in its own right.…”

Section: Resultsmentioning

confidence: 95%

“…36 Angular discrimination has allowed the electron correlation and enhanced surface sensitivity in diffraction to be explored leading to the ability to measure the Auger spectrum in coincidence with selected magnetic sublevels of the core-hole states. 37 -39 More recently, an APECS apparatus using a coaxially symmetric mirror analyser and a miniature cylindrical mirror analyser (CMA) has been developed by Mase and co-workers 40 and installed on a multi-purpose UHV chamber at BL12A in the Photon Factory. This apparatus has the advantage that the CMA has a wide solid angle (0.72 sr), which has resulted in an exceptionally high coincidence count-rate.…”

Section: Recent Developments In Apecs Instrumentationmentioning

confidence: 99%

Auger photoelectron coincidence spectroscopy: simplifying complexity

Riessen

Thurgate

2006

Surface & Interface Analysis

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The use of X-ray photoelectron spectroscopy (XPS) is expanding rapidly with the advent of more convenient, high-resolution laboratory-based instruments. The increase in the numbers and distribution of synchrotrons has also fuelled this burgeoning interest. Powell (C. J. Powell, J. Vac. Sci. Technol. A 21 (S42) 2003) has shown that the number of papers published on or using XPS has doubled in the past 10 years. He reports that there are in excess of 3000 papers published using XPS data each year across a wide range of applications, making it the most important technique for the determination of the composition of nano-scale surface films. Yet XPS and the associated technique of Auger-electron spectroscopy (AES) are not yet developed to the stage where the data and its interpretation are unambiguous. Auger photoelectron coincidence spectroscopy (APECS) provides a means of simplifying spectra, allowing for the decomposition of these into components that have a common origin. The spectra so produced provide a unique opportunity to test theory. In this paper, we will review recent progress in developing better APECS spectrometers and illustrate the power of APECS with new data acquired by these.

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A First‐Principles Scheme for Calculating the Electronic Structure of Strongly Correlated Materials: GW+DMFT

Aryasetiawan¹,

Biermann

Georges

2004

Correlation Spectroscopy of Surfaces, Thin Films, and Nanostructures

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Strongly correlated systems are characterized by partially occupied localized orbitals such as found in transition metal oxides or 4f metals. Here the problem is often more of qualitative rather than quantitative nature. It is often found that the LDA predicts a transition metal oxide to be a metal whereas experimentally it is an antiferromagnetic insulator. To cite some examples, LaMnO 3 , famous for its colossal magnetoresistance, and La 2 CuO 4 , a well-known parent compound of high-temperature superconductors, are antiferromagnetic insulators but predicted to be metals by the LDA [39]. In cases where the LDA does predict the correct structure, it is legitimate to ask if the one-particle spectrum is also reproduced correctly. According to the currently accepted interpretation, transition metal oxides may be classified as charge-transfer insulators [18,42], which are characterized by the presence of occupied and unoccupied 3d bands with the oxygen 2p band in between. The gap is then formed by the oxygen 2p and unoccupied 3d bands, unlike the gap in LDA, which is formed by the 3d states (Mott-Hubbard gap). A more appropriate interpretation is to say that the highest valence state is a charge-transfer state: During photoemission a hole is created in the transition metal site but due to the strong 3d Coulomb repulsion it is energetically more favourable for the hole to hop to the oxygen site despite the cost in energy transfer. A number of experimental data, notably 2p core photoemission resonance, suggest that the charge-transfer picture is more appropriate to describe the electronic structure of transition metal oxides. And of course in the case of 4f metals, the LDA, being a one-particle theory, is totally incapable of yielding the incoherent part of the spectral function or satellite structures.The difficulties encountered by the LDA discussed above have prompted a number of attempts at improving the LDA. Notable among these is the GW approximation (GWA), developed systematically by Hedin in the early sixties [20]. He showed that the self-energy can be formally expanded in powers of the screened interaction W , the lowest term being iGW, where G is the Green function. Due to computational difficulties, for a long time the applications of the GWA were restricted to the electron gas. With the rapid progress in computer power, applications to realistic materials eventually became possible about two decades ago. Numerous applications to semiconductors and insulators reveal that in most cases the GWA [10,12] removes a large fraction of the LDA band-gap error. Applications to alkalis show band narrowing from the LDA values and account for more than half of the LDA error (although controversy about this issue still remains [29]).The success of the GWA in sp materials has prompted further applications to more strongly correlated systems. For this type of materials the GWA has been found to be less successful. For example, GW calculation on nickel [8] does reproduce the photoemission quasiparticle band structure rather...

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Development of New Apparatus for Electron–Polar‐Angle‐Resolved‐Ion Coincidence Spectroscopy and Auger–Photoelectron Coincidence Spectroscopy

Cited by 4 publications

References 54 publications

Construction and Evaluation of a Miniature Electron Ion Coincidence Analyzer Mounted on a Conflat Flange with an Outer Diameter of 114 mm

Construction and Evaluation of a Miniature Electron Ion Coincidence Analyzer Mounted on a Conflat Flange with an Outer Diameter of 114 mm

Auger photoelectron coincidence spectroscopy: simplifying complexity

A First‐Principles Scheme for Calculating the Electronic Structure of Strongly Correlated Materials: GW+DMFT

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