Abstract
The energy distribution spectra of photoelectrons emitted normal to the (100) face of tungsten were investigated with respect to their polarisation dependence. The results are compatible with the assumption that surface photoemission vanishes if the exciting light is polarised parallel to the emitting surface. This is demonstrated for the examples of emission from a high density of states at the surface, a surface resonance, and an adsorbate induced level. The measurements also show that emission following direct optical excitation in the bulk is polarisation sensitive, supporting the idea of an anisotropic excitation along a star of k-vectors in the bulk. Some indication is also given of emission in ‘secondary cones’.
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