Figure 1: Calculated geometric structures of the spin isomers (Iso) of Sn₉Fe with the corresponding label containing the multiplicity, the relative energy, the symmetry and electric dipole moment in Debye. The tin atoms are displayed as gray spheres and the iron atom in pink. Both isomers show a very similar geometric structure. However, the electric dipole moment of the quintet isomer is nearly three times larger than the one of the triplet (GM).