Hi there I found the following nice webpage that gives a brief discussion of the Lorentz Oscillator Model of the atom: http://webphysics.davidson.edu/Projects/AnAntonelli/node5.html. It's part of someone's honours thesis. (Unfortunately the pictures are very small, but nevermind.) Can anyone recommend any other resources (webpages, books, textbooks, etc.) that discuss this classical Lorentz Oscillator model of the atom, at a similar level? By similar I mean the S.H.M treatment, and discussion of how this model can be used to understand (some) basic aspects of atom-field interactions. I've searched through various journals, and there are articles discussing the model in some context or the other, but all of these seem very technical and/or specific to some field (e.g applied optics!). Thank you for your help!