Paramagnetic Hyperfine Interactions in a t2g4 Configuration of 57Fe

Abstract
Mössbauer effect experiments have been done on trans‐[Fe(diars)2Cl2]·(BF4)2 in the presence of magnetic fields up to 53 kOe and in temperatures ranging from 4.2 to 348°K. The data have been interpreted in terms of spin Hamiltonian parameters with an effective spin S=1. These parameters in turn have led to a determination of the ligand field which acts on the t2g4 configuration as well as the spin‐orbit coupling.