Results 151 to 160 of about 33,765 (166)

Metallic magnetic calorimeters for high precision QED tests at GSI∕FAIR

AIP Conference Proceedings, 2009
The quantum electrodynamics belongs to the best tested and established theories in modern physics. However, the evaluation of high order processes, as necessary in the presence of large electric fields, is still demanding. Of particular interest in this field is the Lamb shift of highly charged, hydrogen‐like ions, as the theoretically claimed error ...
C. Pies, A. Pabinger, S. Kempf, A. Fleischmann, L. Gastaldo, C. Enss, Betty Young, Blas Cabrera, Aaron Miller   +8 more
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High Precision Wavelength Measurements of QED-Sensitive Forbidden Transitions in Highly Charged Argon Ions

Physical Review Letters, 2003
We present the results of an experimental study of magnetic dipole (M1) transitions in highly charged argon ions (Ar X, Ar XI, Ar XIV, Ar XV) in the visible spectral range using an electron beam ion trap. Their wavelengths were determined with, for highly charged ions, unprecedented accuracy up to the sub-ppm level and compared with theoretical ...
Draganic, I, Lopez-Urrutia, JRC, DuBois, R, Fritzsche, S, Shabaev, VM, Orts, RS, Tupitsyn, II, Zou, Y, Ullrich, J   +8 more
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Accurate tests of QED with precision spectroscopy of molecular deuterium

2022
Molecular hydrogen, in the view of its simplicity, is well suited for testing quantum electrodynamics (QED) for moleculesas well as for searching for new physics beyond the standard model such as new forces or extra dimensions. Furthermore,molecular hydrogen possesses a wide structure of ultranarrow rovibrational transitions with different ...
Zaborowski, Mikołaj, Słowiński, M, Stankiewicz, Kamil, Thibault, Franck, Cygan, A., Jóźwiak, Hubert, Kowzan, Grzegorz, Masłowski, P., Nishiyama, A., Stolarczyk, N, Wojtewicz, S., Ciurylo, Roman, Lisak, D., Wcislo, P   +13 more
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QED Effects in Helium and Comparisons with High Precision Experiment

Physica Scripta, 2001
A large body of work to calculate nonrelativistic energies, relativistic corrections, and quantum electrodynamic (QED) energy shifts in helium is reviewed and compared with experiment. Of particular significance are measurements of the QED (Lamb) shift for the low-lying S-states of helium, where the accuracy rivals the best measurements in the ...
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Precision Tests of QED in Strong Fields and Nuclear Contributions

1995
The most simple of all atoms is hydrogen. One might imagine that its fundamental structure should allow for a theoretical description of the hydrogen spectrum at least as accurate as given by experiment. But as a matter of fact theory could not meet this requirement. E.
G. Soff, G. Plunien, S. M. Schneider, W. Greiner   +3 more
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Precision energy-level measurements and QED of highly charged ions

Canadian Journal of Physics, 2009
A review is given of measurements involving the K-shell (np → 1s) transitions of hydrogenlike ions. In many experiments carried out, for example, on electron-beam ion traps and tokamaks, the calculated energies of the Lyman-series lines are utilized as calibration standards for measuring the energies of lines from more complex ions.
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Status of Precision QED in Light and Heavy Atoms

1987
This paper presents a review of QED in various systems. Precision tests in weakly bound systems are reviewed, tests of radiative corrections in highly ionized atoms and inner shells of neutral heavy atoms are described, and a more speculative application of QED to quarks bound in a cavity is presented.
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High Precision Test of QED and Determination of α

1983
Based on the QED outlined by this author in III, I shall discuss in this section the present status of comparison of QED predictions and experiments.
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An introduction about precise measurements of QED γ structure functions

AIP Conference Proceedings, 1990
Method of measuring QED photon structure functions in pure QED processes is discussed.(AIP)
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High precision calculations and QED effects for two- and three-electron atoms

Physica Scripta, 1993
Essentially exact results can now be obtained for the nonrelativistic energy and lowest-order relativistic corrections of helium. A combination of variational calculations and asymptotic expansion methods covers the entire singly-excited spectrum.
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