Topmost-surface-sensitive Si-2p photoelectron spectra of clean Si(100)-2×1 measured with photoelectron Auger coincidence spectroscopy

Kakiuchi, Takuhiro; Hashimoto, Shogo; Fujita, Narihiko; Tanaka, Masatoshi; Mase, Kenji; Nagaoka, Shin‐ichi

doi:10.1016/j.susc.2010.02.005

Cited by 9 publications

(3 citation statements)

References 13 publications

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“…22 Very recently, we measured Si L 23 VV Auger electron Si 2p photoelectron coincidence spectra (Si 2p-Si L 23 VV PEACS) of Si(100)-2×1, and identified the topmostsurface Si 2p components by taking advantage of the extremely short escape depth of 1.2Å. 23 In this paper, we report on the surface-site-selective Si L 23 VV AES and Si 2p PES of clean Si(111)-7×7 measured with Si L 23 VV-Si 2p APECS and Si 2p-Si L 23 VV PEACS. The Si L 23 VV-Si 2p APECS indicated that the valence band in the vicinity of the rest atoms shifted towards the Fermi level (E F ) relative to that of the pedestal atoms.…”

Section: Introductionmentioning

confidence: 99%

Surface-site-selective study of valence electronic states of a clean Si(111)-7×7 surface using SiL23VVAuger electron and Si 2
Kakiuchi
¹
,
Tahara
²
,
Hashimoto
³

et al. 2011
Phys. Rev. B
Self Cite

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Valence electronic states of a clean Si(111)-7×7 surface are investigated in a surface-site-selective way using high-resolution coincidence measurements of Si L 23 VV Auger electrons and Si 2p photoelectrons. The Si L 23 VV Auger electron spectra measured in coincidence with energy-selected Si 2p photoelectrons show that the valence band at the highest density of states in the vicinity of the rest atoms is shifted by ∼0.95 eV toward the Fermi level (E F ) relative to that in the vicinity of the pedestal atoms (atoms directly bonded to the adatoms). The valence-band maximum in the vicinity of the rest atoms, on the other hand, is shown to be shifted by ∼0.53 eV toward E F relative to that in the vicinity of the pedestal atoms. The Si 2p photoelectron spectra of Si(111)-7×7 measured in coincidence with energy-selected Si L 23 VV Auger electrons identify the topmost surface components, and suggest that the dimers and the rest atoms are negatively charged while the pedestal atoms are positively charged. Furthermore, the Si 2p-Si L 23 VV photoelectron Auger coincidence spectroscopy directly verifies that the adatom Si 2p component (usually denoted by C 3 ) is correlated with the surface state just below E F (usually denoted by S 1 ), as has been observed in previous angle-resolved photoelectron spectroscopy studies.

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Section: Introductionmentioning

confidence: 99%

Surface-site-selective study of valence electronic states of a clean Si(111)-7×7 surface using SiL23VVAuger electron and Si 2
Kakiuchi
¹
,
Tahara
²
,
Hashimoto
³

et al. 2011
Phys. Rev. B
Self Cite

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“…This is due to the fact that both the photoelectron and the Auger electron signals are attenuated due to the finite mean free path, which implies that the coincidence signal attenuates as a product of these effects. This increased surface sensitivity of APECS was for in-stance used to enhance the Si2p signal from the outermost Si atoms for the reconstructed Si(100) 2x1 surface [18]. Using APECS it is also possible to tune the surface sensitivity for the Auger spectra.…”

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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“…From the pioneering experiment performed by Haak et al [21], which demonstrated the feasibility of APECS, the experimental advances, particularly the development of multichannel electron detectors and the advent of energy tunable synchrotron radiation sources stimulated a renewed interest in the study of Auger line shapes of solid [23][24][25] and molecular targets [26][27][28]. A number of experiments conducted to date have shown that APECS has the ability to: isolate individual sites in a solid and probe their local electronic structure [29][30][31], separate overlapping spectral features [32][33][34], probe electronic structure with extremely high surface sensitivity [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

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

Filippo

Trioni

Fratesi

et al. 2015

J. Phys.: Condens. Matter

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We have studied the line shapes of Cu(0 0 1)-p (2 × 2)S L2VV and L3VV Auger decay by means of Auger photoelectron coincidence spectroscopy. Measuring the LVV Auger spectrum in coincidence with S 2p1/2 and 2p3/2 photoelectrons respectively, we have been able to separate the two overlapping Auger spectra and determine their intrinsic line shapes. The two Auger transitions, though shifted in energy, display an identical line shape whose main features can be qualitatively understood considering a single particle approximation but are better described within a Cini-Sawatzky (CS) approach. Comparison between the experimental and the CS calculated spectra confirms that a substantial part of the Auger lines (∼20%) can be ascribed to decay events accompanied by the excitation of one additional electron-hole pair in the valence band. For the first time, the locality of the Auger process combined with the surface sensitivity of the APECS technique and its ability to separate overlapping structures are used to study Auger transitions taking place at the the surface states of a S/noble-metal interface.

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Topmost-surface-sensitive Si-2p photoelectron spectra of clean Si(100)-2×1 measured with photoelectron Auger coincidence spectroscopy

Cited by 9 publications

References 13 publications

Surface-site-selective study of valence electronic states of a clean Si(111)-7×7 surface using SiL23VVAuger electron and Si 2
Kakiuchi
¹
,
Tahara
²
,
Hashimoto
³

et al. 2011
Phys. Rev. B
Self Cite

Surface-site-selective study of valence electronic states of a clean Si(111)-7×7 surface using SiL23VVAuger electron and Si 2
Kakiuchi
¹
,
Tahara
²
,
Hashimoto
³

et al. 2011
Phys. Rev. B
Self Cite

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

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

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Topmost-surface-sensitive Si-2p photoelectron spectra of clean Si(100)-2×1 measured with photoelectron Auger coincidence spectroscopy

Cited by 9 publications

References 13 publications

Surface-site-selective study of valence electronic states of a clean Si(111)-7×7 surface using SiL23VVAuger electron and Si 2Kakiuchi1, Tahara2, Hashimoto3 et al. 2011Phys. Rev. BSelf Cite

Surface-site-selective study of valence electronic states of a clean Si(111)-7×7 surface using SiL23VVAuger electron and Si 2Kakiuchi1, Tahara2, Hashimoto3 et al. 2011Phys. Rev. BSelf Cite

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

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

Contact Info

Product

Resources

About

Surface-site-selective study of valence electronic states of a clean Si(111)-7×7 surface using SiL23VVAuger electron and Si 2
Kakiuchi
¹
,
Tahara
²
,
Hashimoto
³

et al. 2011
Phys. Rev. B
Self Cite

Surface-site-selective study of valence electronic states of a clean Si(111)-7×7 surface using SiL23VVAuger electron and Si 2
Kakiuchi
¹
,
Tahara
²
,
Hashimoto
³

et al. 2011
Phys. Rev. B
Self Cite