Abstract
General rules are given for the branching ratio of x-ray absorption lines. The branching ratio between two spin-orbit split absorption edges of a deep core level will deviate from its statistical value only if the spin-orbit splitting in the valence band is large compared to the band width. The branching ratio obtains a maximum value for the Hund's rule ground state and decreases gradually for the other J values. This regular behaviour can be used to assess the spin-orbit splitting in the 4d and 5d band of transition metal compounds.
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