Direct and core-resonant double photoemission from Cu(001)

Riessen, Grant van; Wei, Zhiguo; Dhaka, R. S.; Winkler, C.; Schumann, F. O.; Kirschner, J.

doi:10.1088/0953-8984/22/9/092201

Cited by 24 publications

(16 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1. 26,27 It consists of two hemispherical electron-energy analyzers with a mean radius of 200 mm equipped with wideangle transfer lenses and position-sensitive detectors. 28 The requirements of coincidence experiments required significant modifications.…”

Section: Methodsmentioning

confidence: 99%

Surface state and resonance effects in electron-pair emission from Cu(111)

et al. 2011

View full text Add to dashboard Cite

We report on an electron-pair emission study from a Cu(111) surface excited by electron impact with different primary electron energies. We identify in the energy spectra, features that can be directly related to the underlying band structure. This, in turn, proves an important assumption in the theoretical description of the pair-emission process, namely that an effective single-particle picture for the electronic structure is an adequate description. With this observation, it is possible to identify the orbital character of the participating valence state. The relative pair-emission intensity from the surface state and 3d states is observed to vary dramatically with the primary energy. We observe particular conditions where the contribution from the Shockley surface state is strong. We propose a simplified model to explain this observation.

show abstract

Section: Methodsmentioning

confidence: 99%

Surface state and resonance effects in electron-pair emission from Cu(111)

et al. 2011

View full text Add to dashboard Cite

show abstract

“…Auger photoelectron coincidence spectroscopy (APECS) has been widely used to study dynamics induced by core-level excitations of surfaces. [12][13][14][15] APECS is more surface sensitive than the conventional SR-CL-PES and Auger electron spectroscopy (AES), because the escape depth (ED) of electrons detected by APECS is given by…”

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

View full text Add to dashboard Cite

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.

show abstract

“…This process is analogous to the double-Auger process in noble gases 14 and similar to photon-induced correlated electron emission from solids 15 . The results have been interpreted as signature of electron correlation in the valence band 10,12 .…”

mentioning

confidence: 92%

“…The spectral intensity on the low energy side of the Auger peak, referred to as low energy tail (LET), has been studied earlier by Auger-photoelectron coincidence spectroscopy (APECS) [10][11][12] and PAES 13 . The APECS studies were inconclusive as they were limited in the energy range studied (30 − 70 eV) and the fact that signal was an average over several atomic layers.…”

mentioning

confidence: 99%

Predominance of multielectron processes contributing to the intrinsic spectra of low-energy Auger transitions in copper and gold

2011

View full text Add to dashboard Cite

Positron-annihilation-induced Auger electron spectroscopy (PAES) was used to obtain Cu and Au Auger spectra that are free of primary-beam-induced backgrounds by impinging the positrons at an energy below the secondary-electron-emission threshold. The removal of the core electron via annihilation in the PAES process resulted in the elimination of post-collision effects. The spectra indicate that there is an intense low-energy tail (LET) associated with the Auger peak that extends all the way to 0 eV. The LET is interpreted as indicative of processes in which filling of the core hole by a valence electron results in the ejection of two or more valence electrons which share the energy of the conventional CVV Auger electron.

show abstract

Direct and core-resonant double photoemission from Cu(001)

Cited by 24 publications

References 22 publications

Surface state and resonance effects in electron-pair emission from Cu(111)

Surface state and resonance effects in electron-pair emission from Cu(111)

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

Predominance of multielectron processes contributing to the intrinsic spectra of low-energy Auger transitions in copper and gold

Contact Info

Product

Resources

About

Direct and core-resonant double photoemission from Cu(001)

Cited by 24 publications

References 22 publications

Surface state and resonance effects in electron-pair emission from Cu(111)

Surface state and resonance effects in electron-pair emission from Cu(111)

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. B

Predominance of multielectron processes contributing to the intrinsic spectra of low-energy Auger transitions in copper and gold

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