Born-Oppenheimer approximation Home › Forums › density functional theory › the Born-Oppenheimer approximation › Born-Oppenheimer approximation This topic has 0 replies, 1 voice, and was last updated 5 days, 17 hours ago by Amy. Viewing 1 post (of 1 total) Author Posts September 3, 2026 at 6:54 pm #14873 AmyParticipant It’s not valid when nuclei move/ the mass of nuclei is not big enough 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