Home › Forums › density functional theory › the Born-Oppenheimer approximation › failure of BO This topic has 0 replies, 1 voice, and was last updated 1 week, 6 days ago by LukasHerygers. Viewing 1 post (of 1 total) Author Posts September 30, 2025 at 9:56 am #13280 LukasHerygersParticipant When the speed of a nuclei is not small compared to the speed of an electron 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