Octahedral symmetry, effect magnetic susceptibility

For the T2 level we need to consider the contribution to the nmr shift by the term proportional to X Xj the Fermi interac tion. Since in these compounds the effective crystal field environment of the iron atom is approximately of octahedral symmetry with a small most likely trigonal component(11,12) we shall assume that the form of the Fermi contact interaction is as given in reference (1). The magnetic susceptibility components Xi. and can be determined from the appropriate equations in ref.(13). (We shall neglect bonding in this paper determining x... 

---