Space charge effect and mirror charge effect in photoemission spectroscopy

Zhou, Xingjiang; Wannberg, B.; Yang, Wanli; Brouet, V.; Sun, Zhe; Douglas, J. F.; Dessau, D. S.; Hussain, Zahid; Shen, Zhi‐Xun

doi:10.1016/j.elspec.2004.08.004

Cited by 125 publications

(135 citation statements)

References 7 publications

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“…The photon flux is indeed so high that measurements with reduced flux are sometimes advisable, when the high intensity leads to detector saturation and energy resolution broadening due to space charge effects. 24 This makes it attractive to further improve the energy resolution, which may be achieved by (a) further improved analyser resolution through the use of even smaller slits, (b) further improved reduction of electronic noise on the sample, and (c) further improvement of the beam energy resolution through operation at higher c-values (thus stronger demagnification of the source) or installation of a grating with higher line density.…”

Section: Discussionmentioning

confidence: 99%

A facility for the analysis of the electronic structures of solids and their surfaces by synchrotron radiation photoelectron spectroscopy

Hoesch

Kim

Dudin

et al. 2017

Review of Scientific Instruments

133

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A synchrotron radiation beamline in the photon energy range of 18 -240 eV and an electron spectroscopy end station have been constructed at the 3 GeV Diamond Light Source storage ring. The instrument features a variable polarisation undulator, a high resolution monochromator, a re-focussing system to form a beam spot of 50x50 µm 2 and an end station for angle-resolved photoelectron spectroscopy (ARPES) including a 6-degrees-of-freedom cryogenic sample manipulator. The beamline design and its performance allow for a highly productive and precise use of the ARPES technique at an energy resolution of 10 -15 meV for fast k-space mapping studies with a photon flux up to 2 • 10 13 ph/sec and well below 3 meV for high resolution spectra.

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Section: Discussionmentioning

confidence: 99%

A facility for the analysis of the electronic structures of solids and their surfaces by synchrotron radiation photoelectron spectroscopy

Hoesch

Kim

Dudin

et al. 2017

Review of Scientific Instruments

133

View full text Add to dashboard Cite

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“…The alignment is sufficiently precise that the gap size along this cut can be no more than 0.7 meV. In all measurements, the probe fluence is 3 nJ/cm 2 (photoemitting 10 6 electrons/cm 2 /pulse); significantly higher probe fluences do not reproduce the same results because the mirror charge effect [18,19] becomes significant, and is modified upon pumping. Because small instabilities in the laser power are linked to the space charge and mirror charge effects, the electron energies also drift over time.…”

Section: Methodsmentioning

confidence: 63%

Photoinduced changes of the chemical potential in superconductingBi2Sr2CaCu2O8+δ

et al. 2015

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The chemical potential of a superconductor is of critical importance since, at equilibrium, it is the energy where electrons pair and form the superconducting condensate. However, in non-equilibrium measurements, there may be a difference between the chemical potential of the quasiparticles and that of the pairs. Here we report a systematic time-and angle-resolved photoemission study of the pump-induced change in the chemical potential of an optimally doped Bi2Sr2CaCu2O 8+δ (Bi2212) sample in both its normal and superconducting states. The change in chemical potential can be understood by separately considering the change in the valence band energy relative to the vacuum, and the change in chemical potential relative to the valence band energy. We attribute the former effect to a changing potential barrier at the sample surface, and the latter effect to the conservation of charge in an asymmetrical density of states. The results indicate that the pair and quasiparticle chemical potentials follow each other even on picosecond timescales.

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“…This sets an upper limit for what photon density on the sample can be used for a certain spectral resolution. These effects are important already at present third generation facilities as shown experimentally by Zhou et al [15]. These effects have also been accurately modeled by Hellmann et al [16] In order to increase the information rate, for high resolution measurements, it is therefore an advantage to use a photon source which operates at a high repetition rate, such as a storage ring facility.…”

Section: D) the Recently Developed Angular Resolved Time Of Flight Elmentioning

confidence: 99%

Electron spectroscopy using ultra brilliant synchrotron X-ray sources

Patanen

Svensson

Mårtensson

2015

Journal of Electron Spectroscopy and Related Phenomena

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Electron spectroscopy using ultra brilliant synchrotron X-ray sources. Journal of Electron Spectroscopy and Related AbstractThe development of photoelectron spectroscopy since the early days of the technique is discussed. The focus is on the interaction between instrumental development and scientific achievements. In particular the opportunities provided by the increasingly brilliant synchrotron radiation sources are discussed. The contribution is focused on core level studies. The recent development is demonstrated by using selected examples obtained at today´s most advanced synchrotron radiation facilities. The spectral resolution and intensity that can be reached at these facilities reveal new effects and provide detailed information on the investigated systems. The examples are mainly taken from studies of atoms and molecules where different effects can be most accurately identified and separated.2

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Space charge effect and mirror charge effect in photoemission spectroscopy

Cited by 125 publications

References 7 publications

A facility for the analysis of the electronic structures of solids and their surfaces by synchrotron radiation photoelectron spectroscopy

A facility for the analysis of the electronic structures of solids and their surfaces by synchrotron radiation photoelectron spectroscopy

Photoinduced changes of the chemical potential in superconductingBi2Sr2CaCu2O8+δ

Electron spectroscopy using ultra brilliant synchrotron X-ray sources

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