Fe4N and PAS homepage › Forums › Fe4N and PAS › Fe4N and PAS This topic has 0 replies, 1 voice, and was last updated 1 year, 10 months ago by Ellen. Viewing 1 post (of 1 total) Author Posts March 16, 2021 at 6:28 am #3755 Score: 0 EllenParticipant FeI and FeII both have a 4-fold rotation axis. So the both have eta equal to zero because of the first theorem. 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