Physical Review LettersNew Resonances in Photon Transition Strength FunctionsPeter Axel, Kyunghan Min, N. Stein, David C. SuttonPublished Apr 1, 1963• 41 citationsPublisherAbstractReceived 19 December 1962DOI:https://doi.org/10.1103/PhysRevLett.10.299©1963 American Physical SocietyDOI10.1103/physrevlett.10.299