Precision measurements in helium at 58 nm: Ground state lamb shift and the 11S-21P transition isotope shift

K. S E Eikema*, W. Ubachs, W. Vassen, W. Hogervorst

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

A source of narrow bandwidth (<800 MHz) tunable laser radiation at 58.4 nm has been developed and is applied to record the 11S-21P transition in 3He and 4He. From the 4He transition frequency of 171 134.8936(58) cm-1 a fivefold improved ground state Lamb shift of 1.3763(58) cm-1 is deduced, in good agreement with the theoretical value of 1.3755(10) cm-1. The measured 11S-21P 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.

Original languageEnglish
Pages (from-to)1216-1219
Number of pages4
JournalPhysical Review Letters
Volume76
Issue number8
Publication statusPublished - 19 Feb 1996

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