Theory of Fe and Mn 2p X-ray absorption for RbMn[Fe(CN)6]

► We calculate the Fe 2p XAS of RbMn[Fe(CN)6] using Fe(CN)6 cluster. ► We predict the Fe 2p XAS in the FM and PI phases considering Mn spin polarization. ► We examine the effect of a uniaxial crystal field on the Fe 2p XAS. ► Backbonding is suppressed owing the Hund's coupling in the Mn 2p XAS.