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 19 hours, 29 minutes ago by jgd15. Viewing 1 post (of 1 total) Author Posts January 26, 2026 at 3:33 pm #14465 jgd15Participant We see that the Born-Oppenheimer approximation breaks downs when the masses are about equal. 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