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

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 Journal › Article › Academic › peer-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 language	English
Pages (from-to)	1216-1219
Number of pages	4
Journal	Physical Review Letters
Volume	76
Issue number	8
Publication status	Published - 19 Feb 1996

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

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.",

author = "Eikema, {K. S E} and W. Ubachs and W. Vassen and W. Hogervorst",

year = "1996",

month = feb,

day = "19",

language = "English",

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pages = "1216--1219",

journal = "Physical Review Letters",

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T1 - Precision measurements in helium at 58 nm

T2 - Ground state lamb shift and the 11S-21P transition isotope shift

AU - Eikema, K. S E

AU - Ubachs, W.

AU - Vassen, W.

AU - Hogervorst, W.

PY - 1996/2/19

Y1 - 1996/2/19

N2 - 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.

AB - 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.

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JO - Physical Review Letters

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

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