Spectroscopy of atomic hydrogen

Biraben, F.

doi:10.1140/epjst/e2009-01045-3

Cited by 56 publications

(39 citation statements)

References 89 publications

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“…If it does become possible to measure the Rydberg constant with Ps to a part in 10 12 , doing so will certainly be very challenging. One may well ask why it is worthwhile to attempt such a measurement when there already exist much more precise measurements, obtained from various other systems, especially hydrogen [610]. This is a very reasonable question, and the answer is related to what has become known as the "proton radius puzzle" [157,159].…”

Section: Precision Spectroscopymentioning

confidence: 99%

“…These include microwave Lamb shift [605] measurements [619,620] performed using the separated oscillatory field method of Ramsay [621], as well as optical 2S-nS/D transitions in hydrogen [161,162,610,[622][623][624]) (for some reason, always with even values of n). It is clear from this figure that the spread of all the individual measurements that go into the final value is considerably larger than the apparent eventual discrepancy, which implies that even if a small systematic error in these measurements exists, it could be sufficient to resolve the puzzle.…”

Section: Precision Spectroscopymentioning

confidence: 99%

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Experimental progress in positronium laser physics

2018

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Abstract. The field of experimental positronium physics has advanced significantly in the last few decades, with new areas of research driven by the development of techniques for trapping and manipulating positrons using Surko-type buffer gas traps. Large numbers of positrons (typically ≥10 6 ) accumulated in such a device may be ejected all at once, so as to generate an intense pulse. Standard bunching techniques can produce pulses with ns (mm) temporal (spatial) beam profiles. These pulses can be converted into a dilute Ps gas in vacuum with densities on the order of 10 7 cm −3 which can be probed by standard ns pulsed laser systems. This allows for the efficient production of excited Ps states, including long-lived Rydberg states, which in turn facilitates numerous experimental programs, such as precision optical and microwave spectroscopy of Ps, the application of Stark deceleration methods to guide, decelerate and focus Rydberg Ps beams, and studies of the interactions of such beams with other atomic and molecular species. These methods are also applicable to antihydrogen production and spectroscopic studies of energy levels and resonances in positronium ions and molecules. A summary of recent progress in this area will be given, with the objective of providing an overview of the field as it currently exists, and a brief discussion of some future directions.

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Section: Precision Spectroscopymentioning

confidence: 99%

Section: Precision Spectroscopymentioning

confidence: 99%

Experimental progress in positronium laser physics

2018

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“…From QED theory and accurate measurements, the fine structure constant [1,2], the Rydberg constant [3], nuclear charge radii [4,5] and the electron mass can be deduced [6]. It can also provide accurate ionization energies for one-and two-electron atoms.…”

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confidence: 99%

High-Precision Spectroscopy of the Forbidden2 S13→2
Notermans
¹
,
Vassen
²

2014
Phys. Rev. Lett.
40
2
36
0
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High-precision spectroscopy of the forbidden 2 3 S 1 → 2 1 P 1 transition in quantum degenerate metastable helium We have measured the forbidden 2 3 S1 → 2 1 P1 transition at 887 nm in a quantum degenerate gas of metastable 4 He atoms confined in an optical dipole trap. The determined transition frequency is 338 133 594.4 (0.5) MHz, from which we obtain an ionization energy of the 2 1 P1 state of 814 709 148.6 (0.5) MHz. This ionization energy is in disagreement by > 3σ with the most accurate quantum electrodynamics (QED) calculations available. Our measurements also provide a new determination of the lifetime of the 2 1 P1 state of 0.551 (0.004)stat ( +0.013 −0.000 )syst ns, which is the most accurate determination to date and in excellent agreement with theory.

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“…(1) describes the effect of the finite size of the nucleus in terms of the r.m.s proton charge radius r p for S-states. For hydrogen this term contributes very little to the total energy 1 , but adds the largest part to the uncertainty, if the value of the proton charge radius is taken from elastic electron proton scattering (see for example table 2 of [5]). In muonic hydrogen the electron is replaced by a muon which possesses a ≈ 200 times larger mass.…”

Section: Introductionmentioning

confidence: 99%

Precision spectroscopy on atomic hydrogen

et al. 2011

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Abstract. Precise determinations of transition frequencies of simple atomic systems are required for a number of fundamental applications such as tests of quantum electrodynamics (QED), the determination of fundamental constants and nuclear charge radii. The sharpest transition in atomic hydrogen occurs between the metastable 2S state and the 1S ground state. Its transition frequency has now been measured with almost 15 digits accuracy using an optical frequency comb and a cesium atomic clock as a reference [1]. A recent measurement of the 2S − 2P 3/2 transition frequency in muonic hydrogen is in significant contradiction to the hydrogen data if QED calculations are assumed to be correct [2,3]. We hope to contribute to this so-called "proton size puzzle" by providing additional experimental input from hydrogen spectroscopy.

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Spectroscopy of atomic hydrogen

Abstract: Abstract. This article presents a review of the most recent theoretical and experimental results in hydrogen. We particularly emphasize the methods used to deduce the Rydberg constant R∞ and we consider the prospects for future improvements in the precision of R∞.

Cited by 56 publications

References 89 publications

Experimental progress in positronium laser physics

Experimental progress in positronium laser physics

High-Precision Spectroscopy of the Forbidden2 S13→2
Notermans
¹
,
Vassen
²

2014
Phys. Rev. Lett.
40
2
36
0
View full text Add to dashboard Cite

Precision spectroscopy on atomic hydrogen

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Spectroscopy of atomic hydrogen

Abstract: Abstract. This article presents a review of the most recent theoretical and experimental results in hydrogen. We particularly emphasize the methods used to deduce the Rydberg constant R∞ and we consider the prospects for future improvements in the precision of R∞.

Cited by 56 publications

References 89 publications

Experimental progress in positronium laser physics

Experimental progress in positronium laser physics

High-Precision Spectroscopy of the Forbidden2 S13→2 Notermans1, Vassen2 2014Phys. Rev. Lett.402360View full textAdd to dashboardCite

Precision spectroscopy on atomic hydrogen

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High-Precision Spectroscopy of the Forbidden2 S13→2
Notermans
¹
,
Vassen
²

2014
Phys. Rev. Lett.
40
2
36
0
View full text Add to dashboard Cite