Home › Forums › density functional theory › the Born-Oppenheimer approximation › Born Oppenheimer approximation (invalid) This topic has 0 replies, 1 voice, and was last updated 1 year, 3 months ago by sosafi. Viewing 1 post (of 1 total) Author Posts March 25, 2024 at 2:11 pm #10687 sosafiParticipant The approximation will be invalid when the velocity of nuclei is comparable to electrons 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