Home › Forums › density functional theory › the Born-Oppenheimer approximation › BO approximation not valid in which case? This topic has 0 replies, 1 voice, and was last updated 2 years, 1 month ago by jy12amu. Viewing 1 post (of 1 total) Author Posts October 21, 2022 at 4:49 pm #7378 jy12amuParticipant Probably in some cases in nuclear physics and nuclear chemistry, where we need to study break up of Nucleus, we will have to consider its motion. 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