New theoretical results about the anisotropy of the secondary emission of Al(001) and Al(110)

The source function giving the number of electrons acquiring the energy E and the direction of propagation Ω at the depth z in a target of aluminium submitted to a bombardment of electrons of an energy of 350 eV is evaluated by a Monte Carlo calculation. This source function is used to study the anisotropy of the secondary electron emission. The influences of the depth dependence and of the anisotropy of the source function on the anisotropy of the secondary electron emission on Al(001) and Al(110) are negligible. These results are considered as an evidence that the observed anisotropy in the emitted beam is due to electron final state effects.