Home › Forums › Hyperfine course › a nucleus with a general shape ? › Complications without multipole This topic has 0 replies, 1 voice, and was last updated 1 year, 9 months ago by DriesHendrikx. Viewing 1 post (of 1 total) Author Posts February 27, 2023 at 7:14 pm #3994 DriesHendrikxParticipant For perturbation theory, you need the eigenfunctions of the nucleus and the electron cloud, but these are hard to calculate without using the multipole expantion up to some order. This topic was modified 1 year, 9 months ago by DriesHendrikx. 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