Non-dipole angular anisotropy parameters of photoelectrons from semi-filled shell atoms

Abstract

Abstract. We present the results of calculations of outer and next to the outer shell non-dipole angular anisotropy parameters of photoelectrons for semi-filled shell atoms in the Hartree-Fock (HF) one-electron approximation and with account of inter-electron correlations in the frame of the Spin Polarized Random Phase Approximation with Exchange (SP RPAE). We demonstrate for the first time that this characteristic of photoionization process is essentially sensitive to the fact whether the photoelectron has the same or opposite spin orientation to that of the semi-filled shell.PACS 32.80.Fb.

Some peculiarities of the energy level, photoelectron and photoexcitation spectra of the atoms with a half-filled shell

“…A large number of state mixing, correlation and relativistic effects vanish for a configuration with a half-filled shell; therefore spectra of such atoms are usually described rather exactly by the single-configuration approximation. Quite good or even very good agreement of the results calculated in this approximation with the experimental data was noticed for 2p-3d photoexcitation in Cr and Mn [7,8], for 2p photoelectron spectra of the same elements [7,9,10], for 3p-3d excitation in Mn [7], for the nondipole angular anisotropy parameters at 3p photoionization in P and 3d photoionization in Cr and Mn [5], etc.…”

“…The shell of equivalent electrons can be divided into two subshells with the spins of electrons directed up and down [4]. Usually this model is rather inaccurate, but in the case of a half-filled shell, which can be treated as a filled subshell, it can be applied successfully [5,6]. On considering various (especially photoelectron and photoabsorption) spectra of atoms with a half-filled shell, fairly good agreement between results calculated in the single-configuration approximation and the experimental data is obtained [5,[7][8][9][10].…”