Home › Forums › density functional theory › the Born-Oppenheimer approximation › Outside the BO approximation This topic has 0 replies, 1 voice, and was last updated 1 year, 1 month ago by DavideP. Viewing 1 post (of 1 total) Author Posts March 3, 2024 at 5:22 pm #10639 DavidePParticipant At high temperature the thermal energy could make the ions of the lattice moving faster or with frequencies lattice modes 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