The LVV Auger line shape of sulfur on copper studied by Auger photoelectron coincidence spectroscopy

Filippo, Gianluca Di; Trioni, M. I.; Fratesi, Guido; Schumann, F. O.; Wei, Zhiguo; Li, C H; Behnke, Lars; Patil, Swapnil; Kirschner, J.; Stefani, Giovanni

doi:10.1088/0953-8984/27/8/085003

Cited by 5 publications

(3 citation statements)

References 63 publications

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“…The peaks at lower energy side of S 3p are resonantly enhanced with the Mo 4p edge, indicating these final states have significant Mo 4d contribution mixed into them [33]. The broad peak at the higher energy side of S 3s is due to normal Auger decay peak of S (LVV) [70]. An enhancement in the absorption intensity of the peaks was observed in the binding energy of 9 eV to 15 eV, indicating the emitted electron from S 2p remains at an excited state and behaves as an S(L 2,3 VV) spectator in the decay process [65,66].…”

Section: Resultsmentioning

confidence: 99%

Electronic structure and magnetic behaviors of exfoliated MoS₂ nanosheets

Sarma

Ghosh

Ray

et al. 2019

J. Phys.: Condens. Matter

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The correlation of electronic structure and magnetic behaviors of layered molybdenum disulfide (MoS2) nanosheets, mechanically exfoliated from pristine hexagonal crystal (2H-MoS2) have been studied. Raman spectra show the energy difference (ΔE) between two Raman peaks A1g and was about 20.2 cm−1, indicating the formation of mono-/bi-layered MoS2 nanosheets as obtained after mechanical exfoliation from pristine 2H-MoS2. The absence of the reflection peak (0 0 2) in x-ray diffraction patterns confirms the formation of few-layered and mono-/bi-layered MoS2 nanosheets with reduced thickness. Mo 3d and S 2p XPS core level peaks shifted to higher energy with the reduction of the number of layers in exfoliated MoS2. As the number of layers decreased, valence band maximum position increased from 1.11 eV (pristine MoS2) to 1.57 eV (mono-/bi-layered MoS2 nanosheets), whereas the surface work function (Ф) reduced from 4.85 eV (pristine MoS2) to 4.47 eV (mono-/bi-layered MoS2 nanosheets), as observed from UPS (He-I) measurements. UPS (He-II) spectra, as well as VB-PES spectra of mono-/bi-layered MoS2 nanosheets, exhibits an enhanced valence band density of states (DOS) of S 3p —derived states near Fermi level (Ef). Mo LII-edge and S K-edge x-ray absorption near edge structure spectra of mono-/bi-layered MoS2 nanosheets show the splitting of different peaks that cause a noticeable change in their band structure. Magnetic M–H hysteresis loops measurement clearly demonstrates the increase of room temperature ferromagnetism from pristine to mono-/bi-layer MoS2, due to the existence of defects (‘S’-vacancies or defects at the grain boundaries region) and the increase of DOS.

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Section: Resultsmentioning

confidence: 99%

Electronic structure and magnetic behaviors of exfoliated MoS₂ nanosheets

Sarma

Ghosh

Ray

et al. 2019

J. Phys.: Condens. Matter

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“…For this material U W / 0.8 ≈ hence its Auger lineshape is in the intermediate region between a band-like and atomic like behavior. The complexity of the Auger spectra can be reduced by electron coincidence spectroscopy and significant experimental advances have been made in the past [6,[8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Core-resonant double photoemission from palladium films

Kostanovskiy

Schumann

Aliaev

et al. 2015

J. Phys.: Condens. Matter

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We studied the core-resonant double photoemission process from palladium films with linearly polarized synchrotron radiation. We excited either the 3d or 4p core level and focused on the Auger transitions which leave two holes in the valence band. We find that the two-dimensional energy distributions are markedly different for the 3d and 4p decay. The 3d decay can be understood by a sequential emission of the two electrons while the 4p decay proceeds in a single step. Despite the large differences in the two-dimensional energy spectra we find the shape of the energy sum spectra rather similar. For the description of the 4p decay we propose a model which uses available single electron spectra, but suggest an alternative interpretation of these data. With this we are able to explain the range over which the available energy is shared. Key assumptions of the model are verified by our experiments on the 3d decay.

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“…APECS has also been used to study the electronic structure of the Cu(001)-p(2x2)S adsorbate system [21]. The overlapping L 2 V V and L 3 V V spectra could be separated by measuring in coincidence with the S 2p 1/2 and 2p 3/2 photoelectron lines, respectively, and their intrinsic line shapes could be determined.…”

Section: Auger Photoelectron Coincidence Spectroscopy -Apecsmentioning

confidence: 99%

The CoESCA station at BESSY: Auger electron-Photoelectron coincidences from surfaces demonstrated for Ag MNN

Leitner

Born

Bidermane

et al. 2020

Preprint

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In this work, we present the CoESCA station for electron-electron coincidence spectroscopy from surfaces, built in a close collaboration between Uppsala University and Helmholtz-Zentrum Berlin at the BESSY II synchrotron facility in Berlin, Germany. We start with a detailed overview of previous work in the field of electron-electron coincidences, before we describe the CoESCA setup and its design parameters. The system is capable of recording shot-to-shot resolved 6D coincidence datasets, i.e. the kinetic energy and the two take off angles for both coincident electrons. The mathematics behind extracting and analysing these multi-dimensional coincidence datasets is introduced, with a focus on coincidence statistics, resulting in fundamental limits of the signal-to-noise ratio and its implications for acquisition times and the size of the raw data stream. The functionality of the CoESCA station is demonstrated for the example of Auger electron -photoelectron coincidences from silver surfaces for photoelectrons from the Ag 3d core levels and their corresponding MNN Auger electrons. The Auger spectra originating from the different core levels, 3d 3/2 and 3d 5/2 could be separated and further, the two-hole state energy distributions were determined for these Auger decay channels.

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The LVV Auger line shape of sulfur on copper studied by Auger photoelectron coincidence spectroscopy

Cited by 5 publications

References 63 publications

Electronic structure and magnetic behaviors of exfoliated MoS₂ nanosheets

Electronic structure and magnetic behaviors of exfoliated MoS₂ nanosheets

Core-resonant double photoemission from palladium films

The CoESCA station at BESSY: Auger electron-Photoelectron coincidences from surfaces demonstrated for Ag MNN

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The LVV Auger line shape of sulfur on copper studied by Auger photoelectron coincidence spectroscopy

Cited by 5 publications

References 63 publications

Electronic structure and magnetic behaviors of exfoliated MoS2 nanosheets

Electronic structure and magnetic behaviors of exfoliated MoS2 nanosheets

Core-resonant double photoemission from palladium films

The CoESCA station at BESSY: Auger electron-Photoelectron coincidences from surfaces demonstrated for Ag MNN

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Product

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Electronic structure and magnetic behaviors of exfoliated MoS₂ nanosheets

Electronic structure and magnetic behaviors of exfoliated MoS₂ nanosheets