eV Satellite Research Articles

A theory of spin polarization of resonant photoemission in nickel

By calculations based on a two hybridized band model, a strong spin polarization with a maximum near 3p-threshold is shown for the resonant 6 eV satellite of 3d-photoemission spectra in ferromagnetic Ni. The interference effect due to the direct transition is also discussed.

An SCF- Xα MO study of core photoemission satellites in gaseous TiI 4, VCl 4, RuO 4 and NiCl 2

SCF- Xα MO calculations for TiCl 4, TiI 4, VCl 4, RuO 4 and NiCl 2 indicate that ligand p → metal d orbital excitations will generate metal core photoemission satellites having small intensities (∼5–10% that of the main peak) and low energies (<5eV from the main peak for the halides). The calculated energies and intensities are in reasonable agreement with experiment for TiCl 4 and TiI 4, the only molecules whose satellite spectra have been studied. The high intensity of the higher-energy (>7 eV) satellites observed for the Ti compounds is not reproduced by the present calculations, in which bound empty orbitals of Rydberg character are employed. It is suggested that the final-state orbital in the high-energy satellite case is actually a continuum orbital of “shape-resonance” type which is localized in the interior of the molecule.

Resonant5fvalence-band satellite at the5dthreshold in uranium metal

Photoelectron energy distribution curves for polycrystalline $\ensuremath{\alpha}$-uranium show a giant Fano-type resonance for the intensity of the $5f$ valence-band features at the Fermi energy ${E}_{F}$, when the photon energy is tuned through the $5d$ core absorption edge at around $h\ensuremath{\nu}\ensuremath{\approx}94 \mathrm{to} 103$ eV. Further, a sharp (full width at half maximum = 2.2 eV) $5f$ satellite excitation at an initial energy ${E}_{i}=\ensuremath{-}2.3$ eV below ${E}_{F}$ has been observed, which has a close analogy to the "6 eV satellite" in Ni. This shakeup satellite shows also a strong resonant enhancement (\ensuremath{\ge} 6 times) at the $5d$ core-level threshold, but a distinctly different cross-section dependence. The origin of the resonances of the $5f$ main line and the 2.3-eV satellite is discussed in an atomic framework taking $5f$ and $6d$ screening into account.

Nature of the 3.8 eV plasmon in x-ray photoemission from silver

Overlayer experiments show that the 3.8 eV satellite in X-ray photoemission from silver is due almost entirely to the excitation of extrinsic surface plasmons.

Charge transfer shake-up satellites in X-ray photoelectron spectra of solid compounds of 3d 0 ions

Satellite structure has been observed at 8 eV and 12 eV below the main metal 2p peaks for compounds of Sc 3+ and Ti 4+. These features are attributed to charge transfer “shake-up”: transitions (t 2g → t 2g * and e g → e g * respectively). The 8 eV satellites are only found in sulphate complexes of Sc 3+. This is the first observation of satellites which are probably due to t 2g → t 2g * monopole charge transfer transitions. The probability for this transition is usually low, resulting in the observation of satellites due to the e g → e g transition.