Toy model question homepage › Forums › toy model quadrupole term › Toy model question This topic has 1 reply, 2 voices, and was last updated 1 year ago by Brent Van Neste. Viewing 2 posts - 1 through 2 (of 2 total) Author Posts March 9, 2022 at 9:50 am #4347 Score: 0 WoutStoffelsParticipant For a smaller value of l/d, the total quadrupole energy contribution becomes smaller as well. So the monopole + quadrupole approximation is most accurate when the correction is small. This has nothing to do with perturbation theory though! March 12, 2022 at 4:54 pm #4397 Score: 0 Brent Van NesteParticipant Yes, I agree. I thought we were working in the case without overlap so then we would not take perturbation theory into account. Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In