Preliminary Measurement of the J = 0 to J = 2 Fine Structure Interval in the 3 3P State of Helium Feldman, M. ; Breeden, T. ; Dimauro, L. ; Dong, T. ; Metcalf, H. Abstract Publication: Precision Measurement and Fundamental Constants Pub Date: August 1981 Bibcode: 1981pmfc.conf..153F