Home › Forums › Hyperfine course › electric quadrupole interaction › case studies / symmetry – task 1 › Symmetry axes This topic has 0 replies, 1 voice, and was last updated 1 year, 6 months ago by DriesHendrikx. Viewing 1 post (of 1 total) Author Posts March 20, 2023 at 11:13 pm #4447 DriesHendrikxParticipant For the Fe-I, there is a 4-fold rotation axis. For the Fe-II, there is also a 4-fold rotation axis. => Both theorems 1 and 2 are valid is this case, so the EFG tensor is zero. 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