‎"BETHE, H. A.‎
‎The Electromagnetic Shift of Energy Levels.‎

‎Lancaster, American Physical Society, 1947. Lex8vo. Entire volume offered in the original blue wrappers. With small stamp to front wrapper. In ""The Physical Review"" Volume 72, August 15, No. 4, 1947 of , Second Series. Spine lacking (but leaves still firmly attached). Holes near spine after hanving being stapled. Internally fine and clean. Pp. 339-341. [Entire volume: Pp. 263-356].‎

Reference : 46570

‎First printing of Bethe's famous paper on electromagnetic shift of energy levels which gave the first indication of a possible way out of the unequivocally exposed discrepancies of Lamb shift and magnetic moments.Bethe completed the first non-relativistic computation of the shift of the lines of the hydrogen atom as measured by Lamb and Retherford. Despite the limitations of the computation, agreement was excellent. Based on Bethe's intuition and fundamental papers on the subject by Sin-Itiro Tomonaga Julian Schwinger Richard Feynman it was finally possible to get fully covariant formulations that were finite at any order in a perturbation series of quantum electrodynamics. ‎