Home › Forums › density functional theory › the Born-Oppenheimer approximation › Where the Born-Oppenheimer approximation may fail This topic has 0 replies, 1 voice, and was last updated 1 week ago by Gregb26. Viewing 1 post (of 1 total) Author Posts May 27, 2025 at 8:48 pm #12506 Gregb26Participant The Born-Approximation may fail when the motion of the electrons are not sufficiently faster than that of the nuclei. This can happen if we have “heavy” electrons that do not move very fast, or if the motion of the nuclei is not negligible. 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