Home › Forums › Hyperfine course › magnetic hyperfine interaction › in free atoms – task 1 › Orientation of L and S This topic has 0 replies, 1 voice, and was last updated 1 year, 9 months ago by DriesHendrikx. Viewing 1 post (of 1 total) Author Posts March 12, 2023 at 3:12 pm #4199 DriesHendrikxParticipant J can only be 2 if L=1 and S=1, so L and S are parallel. J=0, therefore (L,S) must be (1,-1), so L and S are antiparallel. J=1 is only possible when (L,S) = (1,0) or (0,1), so they are perpendicular. 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