Investigation of the Electronic Structure of Molybdenum Single Crystal Surfaces by Means of the Positron Annihilation Method

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Abstract
A model is proposed explaining the “fine structure” of angular distribution curves of annihilation photons (ACAP) obtained by the interaction of positrons with the electron density on the crystal surface. Data were presented which prove the influence of a deformation on the (110) plane of Mo and of weak magnetic fields (1.2 Oe) on the shape of ACAP curves obtained from the surface of this crystal face. The deformation effect is discussed in conjunction with the interaction between positrons and crystal structure defects on the crystal surface. The influence of a weak magnetic field is discussed with the excitement of the surface magnetic levels.