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Spin polarization and magnetic dichroism in photoemission from core and valence states in localized magnetic systems.

Using group theory we derive a general model for spin polarization and magnetic dichroism in photo-emission in the presence of atomic interactions between the hole created and the valence holes. We predict strong effects in the photoemission from core levels and localized valence levels of transition metal and rare-earth compounds. In the presence of electrostatic interactions between the created hole and magnetically polarized valence electrons, we can distinguish eight fundamental spectra: the isotropic spectrum, spin spectrum, orbit spectrum (magnetic circular dichroism), spin-orbit spectrum, spin-orbit magnetic-quadrupole spectrum, anisotropic spectrum (magnetic linear dichroism), anisotropic spin magnetic-dipole spectrum , and anisotropic spin magnetic-octupole spectrum. Examples are given for the 2p, 3s, 3p, and 3d photoemission from divalent Cu, Co d7, and Fe d6.