Carbon. So is it known what energy levels for electrons in glass atoms are in eV to move to a higher shell level. Glass does not absorb any light, except UV. but what is the eV for the glass electron to get excited and leave the ground state, and move up to shell level 2, or energy band 2. Also when carbon electrons are in the ground state, how much eV from light or any other EM radiation does it take for the electron to jump to shell/ energy band 2, and to shell 3, up to the point where the electron would leave the atom. The reason I want to know about eV levels in carbon because it is the material the human body, as well as oxygen, and hydrogen, and some others. I am studying neuroscience, and how to make human tissue less opaque, if it possible to do. Thank you for your help, anything helps even a few words.