On the basis of both our work on electronic structures and positron annihilation lifetimes for point defects and point-like defects in aluminium and the comparison with the related experimental data in details

the applicability of the jellitum model as well as its correction are described. The validity and limitations of other density functional theory methods such as Puska’s noninteraction atom model and PLAPW method are also discussed. It is shown that the jellium model is a useful tool to calculate the electronic structures of smaller voids （dia. <4nm） in metals.