Home › Forums › density functional theory › the Born-Oppenheimer approximation › Born Oppenheimer approximation This topic has 0 replies, 1 voice, and was last updated 1 week, 3 days ago by sarae_02. Viewing 1 post (of 1 total) Author Posts October 3, 2025 at 8:30 am #13368 sarae_02Participant The approximation would not be valid the velocities of the nuclei and the electron are similar. for example, this could be when the temperature gets close to 0K. 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