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A source of narrow bandwidth ({lt}800 MHz) tunable laser radiation at 58.4 nm has been developed and is applied to record the 1{sup 1}{ital S}{minus}2{sup 1}{ital P} transition in {sup 3}He and {sup 4}He. From the {sup 4}He transition frequency of 171134.8936(58) cm{sup {minus}1} a fivefold improved ground state Lamb shift of 1.3763(58) cm{sup {minus}1} is deduced, in good agreement with the theoretical value of 1.3755(10) cm{sup {minus}1}. The measured 1{sup 1}{ital S}{minus}2{sup 1}{ital P} transition isotope shift of 263410(7) MHz presents a more than 2 order of magnitude improvement over a previous value and agrees with a theoretical value of 263411.26(11) MHz. {copyright} {ital 1996 The American Physical Society.}

physical review letters

Precision Measurements in Helium at 58 nm: Ground State Lamb Shift and the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mn>1</mml:mn></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math><i>S</i>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow><mml:mn>1</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math><i>P</…

Precision Measurements in Helium at 58 nm: Ground State Lamb Shift and the11S-21P