EPR irradiation homepage › Forums › what happens with EPR ? › EPR irradiation This topic has 0 replies, 1 voice, and was last updated 5 years ago by Giel. Viewing 1 post (of 1 total) Author Posts May 7, 2018 at 12:42 pm #1617 Score: 0 GielParticipant When the incoming photon has the right energy, the system will absorb it and the spin of the electron cloud will change, bringing it to a higher energy state. 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