George, M. C.Hessels, E. A.Lombardi, L. D.2004-12-032004-12-0320012001http://hdl.handle.net/2003/137910.17877/DE290R-11169enThe American Physical SocietyPhysical Review Letters530Precision Microwave Measurement of the 23P1-23P0 Interval in Atomic Helium: A Determination of the Fine-Structure Constant10.1103/PhysRevLett.87.173002article (journal)