Bulk electron-momentum density

Grider has studied photoemission from copper with adsorbed Br, F, ion, thiourea, and pyridine. He proposed that the major effect attributable to adsorption of halide ions and thiourea was partial relaxation of the conservation of electron momentum parallel to the surface. In the case of R4N ion adsorption, the structure of the yield ratio of photocurrents produced by p-and -polarized light shifted with photon energy, and this was explained by an increase in the local density of electrons near the surface due to the adsorption, which can cause scattering effects. Pyridine, upon adsorption, similarly affected the yield ratio structure at bulk concentrations >10 M, but a clear understanding of this result remains to be attained. Grider et also have provided evidence that partial relaxation of parallel momentum conservation occurs for in situ photoemission from a single-crystal copper... 

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