Abstract
The Ta -VV Auger spectrum of TaC(111) has been measured in coincidence with photoemission from the bulk and surface shifted Ta 4 core levels. Good agreement is found between the surface Auger spectrum and a self-convolution of the density of states (SCDOS) at surface Ta sites determined by a first-principles calculation. The bulk spectrum disagrees with the bulk SCDOS but is well described by an incoherent sum of the bulk SCDOS and the surface spectrum. A novel off-site Auger decay mechanism, first observed on Ta(100), accounts for these observations.
- Received 19 August 1991
DOI:https://doi.org/10.1103/PhysRevLett.68.2247
©1992 American Physical Society