The positron lifetimes for voids are related with the effective volume of the voids of some metals from the theoretical points of view. By means of the density functional formalism and local density approximation
the positron annihilation lifetime for voids of various sizes in the metal have been calculated systematically. It is shown that the positron annihilation technique is a powerful method for investigating the structure of the defects in metal.
关键词
Keywords
references
P. Jena et al . , Phys. Rev. , B20 , 3543 ( 1979 ).
O. Gunnarsson et al . , Phys. Rev. , B10 , 1319 ( 1974 ).
W. Brandt and J. Reinheimer , Phys. Lett. , 35A , 457 ( 1971 ).
M. J. Puska and R. M. Nieminen , J. Phys. F: Met. Phys. , 13 , 333 ( 1983 ).