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 Mar 21 awarded Popular Question Jun 18 awarded Popular Question Sep 24 awarded Autobiographer Jul 2 awarded Curious Oct 29 awarded Teacher Oct 29 accepted Distinction between Larmor frequency and Rabi frequency Oct 29 answered Distinction between Larmor frequency and Rabi frequency Oct 29 asked Does pure electric dipole have higher order moments? Sep 2 asked How does QFT help with entanglement? Aug 15 asked Distinction between Larmor frequency and Rabi frequency Jul 31 comment Derivation for 7.14 in Atomic Physics by Foot @neutrino no worries. yeah definitely. it was my first time learning atomic physics. Jul 31 accepted Derivation for 7.14 in Atomic Physics by Foot Jul 31 comment Derivation for 7.14 in Atomic Physics by Foot @neutrino Anyway I should give you the credit. Otherwise it's going to be unfair. Although I really want to know how Foot arrive at 7.14 Jul 31 comment Derivation for 7.14 in Atomic Physics by Foot @neutrino You're right. That seems really silly. I don't get why Foot skipped so many steps in an introductory textbook... Also it seems that he didn't apply the rotating wave approximation to get rid of the diagonal terms of the perturbative Hamiltonian. Jul 31 revised Derivation for 7.14 in Atomic Physics by Foot edited body Jul 31 revised Derivation for 7.14 in Atomic Physics by Foot added 585 characters in body Jul 31 comment Derivation for 7.14 in Atomic Physics by Foot @neutrino Thanks a lot for the detailed explanation. I realised that I made a mistake in my previous comment. What I was actually looking for was the derivation of these equations $$c_1(t)=1$$ $$c_2(t)=\frac{\Omega^*}{2}\{\frac{1-e^{i(\omega_0+\omega)t}}{\omega_0+\omega}+ \frac{1-e^{i(\omega_0-\omega)t}}{\omega_0-\omega}\}"$$ when I "copy and paste" from my previous question, I made such a mistake... I'm sorry for making you do more work(which wasn't necessary as I derived every step up to the system of ODEs already...). Jul 30 awarded Supporter Jul 30 comment Derivation for 7.14 in Atomic Physics by Foot By the way, I voted your answer up. But forgive me for not accepting your answer for now(simply because I was looking for something else, i.e. the way Foot did this question). Jul 30 awarded Commentator