BOA Home › Forums › density functional theory › the Born-Oppenheimer approximation › BOA This topic has 0 replies, 1 voice, and was last updated 14 hours, 1 minute ago by Jeroen Haijen. Viewing 1 post (of 1 total) Author Posts October 2, 2026 at 8:18 am #15163 Jeroen HaijenParticipant when the mass difference between the nucleus and the electron is no longer significant enough, and appreciable interactions can take place. 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