Home › Forums › density functional theory › the Born-Oppenheimer approximation › BO approximation This topic has 0 replies, 1 voice, and was last updated 2 years, 2 months ago by Ine Vanysacker. Viewing 1 post (of 1 total) Author Posts October 5, 2022 at 1:22 pm #6903 Ine VanysackerParticipant At high temperatures, the nuclei have a high thermal energy, so the Born-Oppenheimer approximation is not valid. 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