Precision measurements in helium at 58 nm: Ground state lamb shift and the 1{ital S}-2{ital P} transition isotope shift

Journal Article · Thu Feb 01 00:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.76.1216· OSTI ID:284523

Eikema, K S; Ubachs, W; Vassen, W; Hogervorst, W ^[1]

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1. Laser Centre Vrije Universiteit, Department of Physics and Astronomy, De Boelelaan 1081, 1081 HV Amsterdam (The Netherlands)

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.}

• OSTI ID: 284523
• Journal Information: Physical Review Letters, Vol. 76, Issue 8; Other Information: PBD: Feb 1996
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HELIUM 3
GROUND STATES
LAMB SHIFT
HELIUM 4
HELIUM
ISOTOPES
WIDTH
LASER RADIATION