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The unoccupied 4 f -level position relative to the Fermi energy in barium metal, Δ + ( f 0 → f 1 ) , is estimated as a function of lattice constant. Total energies for initial and final states are obtained via Hartree-Fock-Wigner-Seitz band calculations based on renormalized atom crystal...
Valence-band spectra from single crystals of Ir O 2 reproduce the general features of a recent band-structure calculation. Good agreement with the unusual asymmetric core-electron line shapes is obtained by a perturbation-theory treatment of the d -electron many-body screening response.
A theory for inelastic Mie scattering from rough metal surfaces or metal sols is proposed. A resonant excitation of a localized dipolar plasmon can enhance the cross section, and experimental data relating to the phenomenon in silver and copper are presented. Two distinct effects are noted. One...
Significant differences between modern band theories proposed for Cu-Ni solid solutions leave uncertain the mechanism responsible for their observed ferromagnetism. X-ray spectroscopy, a sensitive probe of the relevant unfilled 3 d states, appears to agree with ferromagnetic...
The electronic structure of silver (100) is calculated using the self-consistent local-orbital method. The work function is found to be 4.2 eV. A large density of surface states is obtained, comparable to that found for Ni(100), and larger than we found for Pd(100). k → ∥ -selected densities...
We have measured the temperature dependence of the velocity of 10-MHz ultrasonic pulses which were propagated along the layers of the dichalcogenides 2 H -Ta S 2 , 1 T -Ta S 2 , and 2 H -Nb Se 2 . In 2 H -Ta S 2 the plate mode velocity shows little temperature dependence above the...
Doppler-shifted acoustic cyclotron resonances have been observed in Be using longitudinal sound waves at frequencies up to 1.1 GHz and shear waves at frequencies up to 650 MHz. The data yield extremal derivatives of Fermi-surface cross-sectional areas. The derivative data are compared with...
An analysis of the possible excitations in the outer part of the electronic structure of YV O 4 , based on the measurement of the characteristic electron-energy losses and x-ray photoelectron spectra is presented. The loss structures below 12 eV and above 22 eV are consistent with the...
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