Sum Rules Of L-Edge X-Ray Magnetic Circularly Polarized Emission For 3d Transition Metals

We propose sum rules of x-ray magnetic circularly polarized emission (XMCPE) at L edges for 3d transition metals. By making use of combinations of incident and emitted photon helicities, z-component expectation values of spin, orbital, magnetic dipole, and quadrupole terms can be obtained separately. The fundamental difference in the sum rules between x-ray magnetic circular dichroism and XMCPE arises from the variety of electron transitions involving core states split by the spin-orbit interaction. The additional electron transition in XMCPE causes complicated angular dependence of the sum rule relation for the spin moment. Our findings promote future L-edge XMCPE measurements, which have not been observed at present.