Home › Forums › Hyperfine course › electric quadrupole interaction › case studies / symmetry – task 1 › Rotation axis and PAS This topic has 0 replies, 1 voice, and was last updated 1 month ago by Robin Steens. Viewing 1 post (of 1 total) Author Posts March 17, 2025 at 7:08 pm #6462 Robin SteensParticipant The Fe-I atoms have at least 3 four-fold axes, making the asymmetry parameter eta 0 and giving us three axes for our PAS. The Fe-II atoms have 1 four-fold axis and 2 two-fold axes, these could be our PAS. 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