Electron-momentum spectroscopy of the core state of solid carbon

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Abstract
Electron-momentum spectroscopy [binary encounter (e,2e)] experimental results are presented for the core state of an amorphous carbon allotrope. The (e,2e) cross section has two identifiable regions. One is a narrow-energy-width core-band peak that does not disperse with momentum. At higher binding energies there is an energy-diffuse multiple-scattering continuum, which is a consequence of (e,2e) collisions with core electrons that are accompanied by inelastic scattering of one or more of the incoming or outgoing electrons. Comparisons of experimental momentum distributions with the Hartree-Fock atomic carbon 1s orbital are presented for both regions.