The phenomenon can be explained with the spatial quantization of the spin moment of momentum.
2.
Remarkably, this single molecule magnet exhibits non-collinear magnetism in which the atomic spin moments of the four Fe atoms point in opposite directions along two nearly perpendicular axes.
3.
This implies that, in principle RIXS has a finite cross section for probing the energy, momentum and polarization dependence of any type of electron-hole excitation : for instance the electron-hole continuum and excitons in band metals and semiconductors, charge transfer and crystal field excitations in strongly correlated materials, lattice excitations ( phonons ), spin moment.
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