Experimental efforts at NIST towards one-electron ions in circular Rydberg states

Tan, Joseph N.; Brewer, Samuel M.; Guise, Nicholas D.

doi:10.1088/0031-8949/2011/t144/014009

Cited by 28 publications

(49 citation statements)

References 10 publications

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“…[39,40] Our work is motivated by efforts at NIST to produce one-electron ions in circular Rydberg states. [21][22][23]41] Other potential applications include portable mass spectrometers (for space-borne or earth-based field instruments), laser spectroscopy, and studies of Rydberg or metastable states in stored highly charged ions.…”

Section: Discussionmentioning

confidence: 99%

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Penning traps with unitary architecture for storage of highly charged ions

Tan¹,

Brewer²,

Guise³

2012

Review of Scientific Instruments

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Penning traps are made extremely compact by embedding rare-earth permanent magnets in the electrode structure. Axially-oriented NdFeB magnets are used in unitary architectures that couple the electric and magnetic components into an integrated structure. We have constructed a twomagnet Penning trap with radial access to enable the use of laser or atomic beams, as well as the collection of light. An experimental apparatus equipped with ion optics is installed at the NIST electron beam ion trap (EBIT) facility, constrained to fit within 1 meter at the end of a horizontal beamline for transporting highly charged ions. Highly charged ions of neon and argon, extracted with initial energies up to 4000 eV per unit charge, are captured and stored to study the confinement properties of a one-magnet trap and a two-magnet trap. Design considerations and some test results are discussed.

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Section: Discussionmentioning

confidence: 99%

“…A simple diagram illustrating the transport, charge state selection by an analyzing magnet, and injection of extracted ions into a Penning trap is provided in Ref. [23].…”

Section: Figmentioning

confidence: 99%

Penning traps with unitary architecture for storage of highly charged ions

Tan¹,

Brewer²,

Guise³

2012

Review of Scientific Instruments

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“…Precision measurements performed using a wide variety of both hydrogenic and non-hydrogenic atoms, ions, and molecules are, of course, also used for QED tests (e.g. [600][601][602][603]), but Ps has some unique properties in this regard, since it has no constituents with internal structure, and the equal mass of the electron and positron mean that it is very sensitive to recoil effects [146]. All QED corrections to Ps energy levels are now known up to order mα 6 [150][151][152], and some of the higher order terms have also been calculated (e.g.…”

Section: Precision Spectroscopymentioning

confidence: 99%

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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“…An independent determination of R ∞ , which is strongly correlated to r p and r d , is another way to shed new light on this problem. Experiments on helium atoms and He + ions [17][18][19], as well as highly charged hydrogenlike ions [20] may ultimately achieve this goal. On a more general level, the proton size puzzle exemplifies how improved and independent determinations of fundamental physical constants from different physical systems provide essential cross checks of our understanding of the physical world.…”

Section: And Hdmentioning

confidence: 99%

Hydrogen molecular ions for improved determination of fundamental constants

et al. 2016

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The possible use of high-resolution rovibrational spectroscopy of the hydrogen molecular ions H + 2 and HD+ for an independent determination of several fundamental constants is analyzed. While these molecules had been proposed for metrology of nuclear-to-electron mass ratios, we show that they are also sensitive to the radii of the proton and deuteron and to the Rydberg constant at the level of the current discrepancies colloquially known as the proton size puzzle. The required level of accuracy, in the 10 −12 range, can be reached both by experiments, using Doppler-free two-photon spectroscopy schemes, and by theoretical predictions. It is shown how the measurement of several well-chosen rovibrational transitions may shed new light on the proton-radius puzzle, provide an alternative accurate determination of the Rydberg constant, and yield new values of the proton-toelectron and deuteron-to-proton mass ratios with one order of magnitude higher precision. From Bohr's model of the atom to the advent of quantum electrodynamics (QED), precision spectroscopy of atomic hydrogen has played a key role in our understanding of matter and its interaction with light. Since the first measurement of the Lamb shift in 1947 [1, 2], the predictions of QED have been verified with an increasing level of accuracy which, together with stringent tests in other areas of physics, led to assume the validity of this theory and use it to extract the values of fundamental physical constants from experimental data [3]. Specifically, available data on the hydrogen (H) and deuterium (D) atoms are used to extract the Rydberg constant R ∞ and the charge radii of the proton (r p ) and deuteron (r d ). Data from electron-proton and electron-deuteron scattering experiments also contribute in this determination.Recently, the undisputed status of these results has been challenged by the measurement of the Lamb shift in muonic hydrogen [4,5]. The very precise value of r p deduced from this experiment is in strong disagreement with previous determinations. The discrepancy with the CODATA adjustment [6] amounts to 5.6σ, or to 4.5σ if only the H and D data are taken into account [3]. Similar discrepancies on the deuteron radius can be inferred through the very precise determination of r 2 d − r 2 p from the 1S-2S H/D isotopic shift [7]. Although many efforts have been undertaken in the last few years, no convincing solution of the "proton size puzzle" has been found so far (see [8] for a review). One of the possible explanations is that the error bars, both of hydrogen spectroscopy and scattering experiments [9] were underestimated. New scattering experiments are in preparation or underway, including electron-proton [10], electron-deuteron [11] and muon-proton scattering [12]. In atomic hydrogen, the 1S-3S(D) [13,14], 2S-2P [15], and 2S-4P [16] transitions are under study in order to cross-check and improve previous results. An independent determination of R ∞ , which is strongly correlated to r p and r d , is another way to shed new light on this prob...

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Experimental efforts at NIST towards one-electron ions in circular Rydberg states

Cited by 28 publications

References 10 publications

Penning traps with unitary architecture for storage of highly charged ions

Penning traps with unitary architecture for storage of highly charged ions

Experimental progress in positronium laser physics

Hydrogen molecular ions for improved determination of fundamental constants

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