Hey, I've been trying to figure out why a protons in identical environments will not undergo spin-spin splitting with one another. From what I understand splitting of a signal for a proton is due to the nucleus of another nearby either opposing the external magnetic field or acting in the same direction as this field. yet identical protons even on the same carbon will not couple with one another regardless of their close proximity. If anyone could shed some light on this process it would be greatly appreciated. Thank you.