Download Hufner Very High Resolution Photoelectron Spectroscopy by Stephan Hüfner PDF

By Stephan Hüfner

Photoemission spectroscopy is among the such a lot generally used how to research the digital constitution of atoms, molecules, and solids and their surfaces. This quantity introduces and surveys the sphere at optimum power and momentum resolutions taking into consideration a brand new variety of functions, particularly for experiences of hot temperature superconductors.

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H¨ ufner Fig. 18. Electron–phonon contribution to the photoemission linewidth Γ of Pb(110): Temperature dependence of Γ for energies ω ωD (circles). The dashed and the solid line represent the calculated electron–phonon contribution at EF = 0 and E = ωmax = 12 meV, shifted vertically to match the experimental data. The inset shows α2 F (ω) as used for the calculation [49]. The vertical offset is due to impurity scattering and final state effects; the electron–electron Γ el−el contribution vanishes at EF (from [97]) contribution, the agreement is suprisingly good.

The electronic density of states N (E) in the superconducting state shows a temperature dependent band gap of the size 2∆(T ) confined by two singularities at ±∆(T ). In more detail, it is given by N (E)/N0 (E) = |E|/ E 2 − ∆2 (T ), 2 High-Resolution Photoemission Spectroscopy 39 Fig. 19. Real and imaginary part of the electron–phonon self-energy Σ el−ph for lead; experimental photoemission (He Iα ) data on the Pb(110) surface (circles) and calculated from [98] (full lines). Upper inset: measured band dispersion close to EF in the normal phase (T ≈ 8 K); the dashed line gives the result of a linear fit to the data points at higher energies (EB > 20 meV).

N. Berglund and W. E. Spicer: Phys. Rev. 136(4A), 1030 (1964) 35. S. Tougaard and P. Sigmund: Phys. Rev. B 25(7), 4452 (1982) 36. N. V. Smith et al: Phys. Rev. B 47, 15476–15481 (1993) 37. S. H¨ ufner et al: J. Electron Spectrosc. Relat. Phenom. 100(1–3), 191–213 (1999) 2 High-Resolution Photoemission Spectroscopy 51 38. S. D. Kevan, editor: Angle Resolved Photoemission – Theory and Current Applications, volume 74 of Studies in Surface Science and Catalysis. Elsevier Science Publishers, Amsterdam–London–New York–Tokyo (1992) 39.

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