Home › Forums › Hyperfine course › electric quadrupole interaction › case studies / symmetry – task 1 › Fe4N This topic has 0 replies, 1 voice, and was last updated 1 month ago by Giel. Viewing 1 post (of 1 total) Author Posts March 15, 2025 at 10:31 am #6406 GielParticipant Fe-I: there are 3 four-fold rotation axes and so eta = 0, and the EFG = 0 for all three axes being used as z-axes of the system. Fe-II: 1 four-fold and 2 two-fold rotation axes, so eta = 0 for the four-fold axis as rotation axis. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In