Home › Forums › Hyperfine course › ERP › EPR on free atoms (1) › EPR on free La atom. This topic has 0 replies, 1 voice, and was last updated 7 months, 2 weeks ago by WannesB. Viewing 1 post (of 1 total) Author Posts May 4, 2024 at 5:05 pm #5799 WannesBParticipant If the La atom absorbs a photon, the spin orientation of the electrons shifts, thus moving the state to a higher energy. 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