  We present here the results of calculations of photoelectrons' angular
anisotropy and spin-polarization parameters for a number of semi-filled shell
atoms. We consider ionization of outer or in some cases next to the outer
electrons in a number of elements from I, V, and VI groups of the Periodic
Table. All calculations are performed with account of multi-electron
correlations in the frame of the Spin Polarized version of the Random Phase
Approximation with Exchange - SP RPAE. We consider the dipole angular
distribution and spin polarization of photoelectrons from semi-filled subshells
and from closed shells that are neighbors to the semi-filled shells. We have
considered also angular anisotropy and spin-polarization of photoelectrons from
some excited atoms that are formed by spin-flip of one of the outer electrons.
To check the accuracy and consistency of the applied SP RPAE approach and to
see the role of the nuclear charge variation only, we have calculated the
dipole angular anisotropy and spin-polarization parameters of 3p - electrons in
K and compare them to Ar and K+ that have the same configuration. Entirely, we
have calculated the angular anisotropy and spin-polarization parameters for
following subshells of atoms N (2p), P (3p), Ar (3p), K+(3p), K(3p), Cr(3p,
3d), Cr*(3d), Mn(3p, 3d), As(3d, 4p), Mo(4p, 4d), Mo*(4d), Tc(4p, 4d), Sb(4d,
5p), Eu(4f). The peculiarities of obtained parameters as function of photon
frequencies are discussed, as well as some specific features of considered
semi-filled shell objects.

Atomic Physics;Chemical Physics