approximation Home › Forums › density functional theory › the Born-Oppenheimer approximation › approximation This topic has 0 replies, 1 voice, and was last updated 5 days, 6 hours ago by Plume. Viewing 1 post (of 1 total) Author Posts September 30, 2026 at 12:55 pm #15148 PlumeParticipant The Born-Oppenheimer approximation could be wrong when the nuclei are actually moving, but I don’t know when that motion could actually take place in a solid. Maybe for visco-elastic solids? 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