Measurement of the<i>n</i>=2 Lamb shift in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>by the anisotropy method

Wijngaarden, A. van; Kwela, J.; Drake, G. W. F.

doi:10.1103/physreva.43.3325

Cited by 50 publications

(44 citation statements)

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“…The simplest such ion for which experimental data on the classic 2S A new measurement of the classic Lamb shift in He + by the anisotropy method has been completed recently [331]. In the process of this work the authors have discovered a previously unsuspected source of systematic error in the earlier experiment [125]. The result of the new experiment [331] is L(2S case.…”

mentioning

confidence: 76%

“…The results of such extrapolation for the 1S, 2S, 2P, 4S-and 4P -states (Z = 1, 2) are presented in [124,13] (see also results of an earlier extrapolation in [125]). The extrapolation in [124,13] was done independently of the exact results in [91,92,99,100,120] for the nonlogarithmic contribution of order α(Zα) 6 and the logarithmic one of order α(Zα) 7 .…”

Section: A Corrections Induced By the Radiative Insertions In The Elmentioning

confidence: 99%

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Theory of light hydrogenlike atoms

2001

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The present status and recent developments in the theory of light hydrogenic atoms, electronic and muonic, are extensively reviewed. The discussion is based on the quantum field theoretical approach to loosely bound composite systems. The basics of the quantum field theoretical approach, which provide the framework needed for a systematic derivation of all higher order corrections to the energy levels, are briefly discussed. The main physical ideas behind the derivation of all binding, recoil, radiative, radiative-recoil, and nonelectromagnetic spin-dependent and spin-independent corrections to energy levels of hydrogenic atoms are discussed and, wherever possible, the fundamental elements of the derivations of these corrections are provided. The emphasis is on new theoretical results which were not available in earlier reviews. An up-to-date set of all theoretical contributions to the energy levels is contained in the paper. The status of modern theory is tested by comparing the theoretical results for the energy levels with the most precise experimental results for the Lamb shifts and gross structure intervals in hydrogen, deuterium, and helium ion He + , and with the experimental data on the hyperfine splitting in muonium, hydrogen and deuterium. *

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confidence: 76%

Section: A Corrections Induced By the Radiative Insertions In The Elmentioning

confidence: 99%

Theory of light hydrogenlike atoms

2001

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“…In recent years there has been a number of theoretical developments which have altered the theory. There was a 4 kHz increase due to a more precise numerical calculation of the α (Za)6m piece [14], a -2.2 kHz change due to quadratic recoil [21,22], a -2.5 kHz effect from radiative recoil [10], a 3.2 kHz contribution from pure recoil [23,24], and thus far a 5.3 kHz addition from two-loop nonrecoil graphs [25,26,27]. These changes currently add up to an 8.2 kHz increase.…”

Section: Experimental Results and Comparison With Theorymentioning

confidence: 99%

“…The coefficients of the logarithmic pieces are known analytically [12] while the nonlogarithmic piece has been estimated and also later calculated numerically [13]. The numerical result quoted above is given by Wijngaarden et al [14]. Recently there also has been a separate calculation carried out by Pachucki [15].…”

Section: Theoretical Expression For the Lamb Shift (2s½-2p½)mentioning

confidence: 91%

Recent Advances in the Theory of the Hydrogen Lamb Shift

Grotch¹

1994

Acta Phys. Pol. A

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The theory of the 2S½-2P½ Lamb shift of hydrogen is discussed and compared to experiment. Recent corrections from radiative recoil of order a(Za)5m2/M and pure recoil of order (Za)6m2/M are reviewed. Contributions of order a2 (Za)5 m have been calculated from certain classes of diagrams. These are described while other as yet uncalculated terms are mentioned. The largest error in the theory is the uncertain measured value of the proton electromagnetic radius.

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“…The difficulty lies in making accurate measurements of relative intensities. A high precision measurement has been carried out by applying this technique to He + [146], but the only experiment at higher Z is for O 7+ [147].…”

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confidence: 99%

Hydrogenic systems, frequency standards and fundamental constants

Flowers

Klein²,

Margolis³

2004

Contemporary Physics

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Hydrogenic (two-body) systems are the only atomic systems for which uncertainties in calculations of the energy levels approach the current state of the art in frequency measurement. This article discusses progress in the theory and measurement of transition frequencies in hydrogenic systems. These studies have relevance to the determination of fundamental constants and the testing of physical theories, especially quantum electrodynamics. A set of high accuracy calculable frequency standards could also be realized by using hydrogenic systems.

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Measurement of then=2 Lamb shift inHe+by the anisotropy method

Cited by 50 publications

References 58 publications

Theory of light hydrogenlike atoms

Theory of light hydrogenlike atoms

Recent Advances in the Theory of the Hydrogen Lamb Shift

Hydrogenic systems, frequency standards and fundamental constants

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