Home › Forums › Hyperfine course › ERP › EPR on free atoms (2) › photon absorbtion This topic has 0 replies, 1 voice, and was last updated 2 weeks, 2 days ago by sennedebruyn. Viewing 1 post (of 1 total) Author Posts April 27, 2025 at 11:51 am #6598 sennedebruynParticipant When the atom absorbs the photon, the orientation between the electron spin and the orbital momentum changes. How much it changes depends on the value of J. 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