FINAL-STATE MAGNETIC DICHROISM IN FE 3S PHOTOEMISSION

Magnetic dichroism measurements using unpolarized MgKalpha radiation a re reported for Fe 3s and 2s x-ray photoemission from ferromagnetic Fe . The Fe 3s level displays a small magnetic dichroism, whereas any dic hroism present in the Fe 2s level is too small to be reliably detected . Since the Fe 3s level does not experience an initial-state spin-orbi t interaction, these results reveal the existence of a final-state mag netic dichroism in photoemission. Two possible sources of the dichrois m are discussed. The first explanation invokes a combination of the Fa no effect and core-valence exchange to introduce magnetic dichroism in to the 3s photoemission. An alternative explanation explores the possi bility that configuration interaction in the 3s hole state introduces 3p(4) hole character into the 3s photoemission, with Fe 3p spin-orbit coupling providing the dichroic behavior. Further theoretical and expe rimental work is needed to definitively assign the origin of the obser ved magnetic dichroism in Fe 3s photoemission.