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We report on a theoretical calculation and a new experimental determinationof the 1s3p ^3P_J fine structure intervals in atomic ^4He. The values from thetheoretical calculation of 8113.730(6) MHz and 658.801(6) MHz for the nu_{01}and nu_{12} intervals, respectively, disagree significantly with previousexperimental results. However, the new laser spectroscopic measurement reportedhere yields values of 8113.714(28) MHz and 658.810(18) MHz for these intervals.These results show an excellent agreement with the theoretical values andresolve the apparent discrepancy between theory and experiment.Comment: 9 pages, 3 figure

physical review letters

Fine Structure of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mi>s</mml:mi><mml:mn>3</mml:mn><mml:mi>p</mml:mi><mml:mtext> </mml:mtext><mml:mmultiscripts><mml:mi>P</mml:mi><mml:mi>J</mml:mi><mml:none /><mml:mprescripts /><mml:none /><mml:mn>3</mml:mn></mml:mmultiscripts></mml:math>Level in Atomic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts /><mml:none /><…

Fine Structure of the1s3p PJ3Level in AtomicHe<…