The role of the composition of organic layer in determining its electronic structure

The dependence of the electronic structure of an organic monolayer on its composition was investigated using two-photon photoelectron spectroscopy. It was found that the binding energy of an extra electron to the monolayer depends on its dielectric constant. The dependence could, in large, be fitted assuming the continuum dielectric model, however the electron affinity of the organic molecules required to fit the data is too large. Several explanations for this result are presented.