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![[Figure 1]](hi2005fig1mag.jpg)
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Figure 1
Schematic illustration of the Δl = +1 dipole transitions from the Gd 2p1/2 level into empty d states for the absorption of a right circularly polarized photon. The magnetic orientation is along the propagation direction of the photon, i.e. parallel to its spin. Due to the exchange interaction, the d bands for spin ↑ and spin ↓ are energetically split (differences in the density of states are neglected). The absorption from a spin ↓ ground state to a spin ↓ final state is preferred with a ratio of 75%/25% resulting in a Fano parameter Pe = −0.5. Likewise, the absorption of a left circularly polarized photon results in a preferred spin ↑ to spin ↑ transition with the same 75%/25% ratio relative to the corresponding spin ↓ to spin ↓ transition. |
![[Figure 1]](hi2005fig1.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
