Abstract
The spectral-momentum density of electrons in a copper thin film has been directly measured using electron momentum spectroscopy. The measured spectral-momentum density shows two distinct features. The first is a free-electron-like parabola with dispersion spanning 10 eV in energy and 0.65 a.u. in momentum. The other is a weak and extended band located in a narrow range of energies from about 2 to 5 eV below the Fermi level. A spherically averaged linear muffin-tin orbital (LMTO) calculation of copper reproduces these features in both the dispersion pattern and the intensity. After taking into account the elastic and inelastic multiple scattering through a Monte Carlo simulation, the agreement between the calculation and the measurement is good. The measurement and the LMTO calculation are also compared with an available linear-augmented-plane-wave calculation for the energy-integrated electron momentum distribution of the valence band and the agreement is also good.
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