3p fine structure of ferromagnetic Fe and Co from photoemission with linearly polarized light

Linear Magnetic Dichroism in the Angular Distribution of the photoelectrons is observed in angular resolved photoemission experiments with linearly polarized light on 3p core levels of the ferromagnetic transition metals. The measured magnetic asymmetry is strictly related to the one observed in photoemission with circularly polarized radiation. Atomic theory shows that the effect is proportional to the state multipoles that characterize the polarization of the hole levels under the exchange interaction. By peak-fitting the experimental dichroic core level spectra and by calculating the relevant multipoles one can resolve the fine structure of the 3p core hole states of ferromagnetic Fe and Co and obtain the m_j ordering of the sublevels. We show that the energy order for the 3p hole-levels of Fe and Co is reversed for the J= 3 2 and J= 1 2 multiplets, and that spin-selected lineshapes can be derived from our analysis and compared with spin-resolved photoemission data.