The pair scattering and the photoemission effect in GaAs

The photoemission effect in GaAs is calculated for photon energies up to 12 eV using a direct transition model and pseudopotential energy bands. The effect of the pair scattering in the energy distribution curves is included using a mean free path approximation and a first order perturbation treatment for the coulombic interaction producing the scattering. The absolute value of the yield function is well reproduced. A detailed discussion of the contribution from scattered and unscattered electrons to the energy distribution curves is performed and their interpretation in terms of the details of the energy bands is given.