scholarly journals Highly charged ions for atomic clocks and search for variation of the fine structure constant

2015 ◽  
Vol 236 (1-3) ◽  
pp. 79-86 ◽  
Author(s):  
V. A. Dzuba ◽  
V. V. Flambaum
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Highly Charged Ions ◽  
Fine Structure Constant ◽  
Atomic Clocks ◽  
Charged Ions

Atomic Clocks and Variations of the Fine Structure Constant

1995 ◽  
Vol 74 (18) ◽  
pp. 3511-3514 ◽  
Author(s):  
John D. Prestage ◽  
Robert L. Tjoelker ◽  
Lute Maleki
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Atomic Clocks

scholarly journals New bounds on dark matter coupling from a global network of optical atomic clocks

2018 ◽  
Vol 4 (12) ◽  
pp. eaau4869 ◽  
Author(s):  
P. Wcisło ◽  
P. Ablewski ◽  
K. Beloy ◽  
S. Bilicki ◽  
M. Bober ◽  
...  
Keyword(s):  
Dark Matter ◽  
Fine Structure ◽  
Cold Atoms ◽  
Atomic Clock ◽  
Structure Constant ◽  
Global Network ◽  
Fine Structure Constant ◽  
Atomic Clocks ◽  
Massive Scalar Field ◽  
Transient Variations

We report on the first Earth-scale quantum sensor network based on optical atomic clocks aimed at dark matter (DM) detection. Exploiting differences in the susceptibilities to the fine-structure constant of essential parts of an optical atomic clock, i.e., the cold atoms and the optical reference cavity, we can perform sensitive searches for DM signatures without the need for real-time comparisons of the clocks. We report a two orders of magnitude improvement in constraints on transient variations of the fine-structure constant, which considerably improves the detection limit for the standard model (SM)–DM coupling. We use Yb and Sr optical atomic clocks at four laboratories on three continents to search for both topological defect and massive scalar field candidates. No signal consistent with a DM coupling is identified, leading to considerably improved constraints on the DM-SM couplings.

scholarly journals Search for transient variations of the fine structure constant and dark matter using fiber-linked optical atomic clocks

2020 ◽  
Vol 22 (9) ◽  
pp. 093010 ◽  
Author(s):  
B M Roberts ◽  
P Delva ◽  
A Al-Masoudi ◽  
A Amy-Klein ◽  
C Bærentsen ◽  
...  
Keyword(s):  
Dark Matter ◽  
Fine Structure ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Atomic Clocks ◽  
Transient Variations

scholarly journals Detection of the 5p – 4f orbital crossing and its optical clock transition in Pr9+

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
H. Bekker ◽  
A. Borschevsky ◽  
Z. Harman ◽  
C. H. Keitel ◽  
T. Pfeifer ◽  
...  
Keyword(s):  
Ion Trap ◽  
Lorentz Invariance ◽  
Structure Constant ◽  
High Sensitivity ◽  
Highly Charged Ions ◽  
Optical Clock ◽  
Fine Structure Constant ◽  
Low Sensitivity ◽  
Orbital Crossing ◽  
Charged Ions

AbstractRecent theoretical works have proposed atomic clocks based on narrow optical transitions in highly charged ions. The most interesting candidates for searches of physics beyond the Standard Model are those which occur at rare orbital crossings where the shell structure of the periodic table is reordered. There are only three such crossings expected to be accessible in highly charged ions, and hitherto none have been observed as both experiment and theory have proven difficult. In this work we observe an orbital crossing in a system chosen to be tractable from both sides: Pr$${}^{9+}$$9+. We present electron beam ion trap measurements of its spectra, including the inter-configuration lines that reveal the sought-after crossing. With state-of-the-art calculations we show that the proposed nHz-wide clock line has a very high sensitivity to variation of the fine-structure constant, $$\alpha$$α, and violation of local Lorentz invariance; and has extremely low sensitivity to external perturbations.

scholarly journals Measurement of Wavelengths and Abundances from Solar Flare X-Ray Spectra

1984 ◽  
Vol 86 ◽  
pp. 151-153
Author(s):  
J.F. Seely ◽  
U. Feldman ◽  
G.A. Doschek
Keyword(s):  
Fine Structure ◽  
Quantum Electrodynamics ◽  
Energy Levels ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Transition Energies ◽  
X Ray ◽  
Hydrogenic Ions ◽  
Charged Ions ◽  
Important Test

The measurement of transition energies in highly charged ions represents an important test of quantum electrodynamics (QED) in strong fields. The OED contributions to the hydrogenic transition energies increase as (αZ)4, where α is the fine structure constant and Z is the atomic number. Transitions in hydrogenic ions of sulfur, chlorine, argon, and iron have previously been measured to a precision of 100 ppm or better. These measurements are in satisfactory agreement with accurate calculations of the energy levels, and this confirms the calculation of the QED contributions to the energy levels of one-electron ions.

scholarly journals New Limit on Space-Time Variations in the Proton-to-Electron Mass Ratio from Analysis of Quasar J110325-264515 Spectra

Symmetry ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 344
Author(s):  
T. D. Le
Keyword(s):  
Fine Structure ◽  
Structure Constant ◽  
Space Time ◽  
Fine Structure Constant ◽  
Electron Mass ◽  
Mass Ratio ◽  
Quasar Spectra ◽  
Time Variations ◽  
Using Data ◽  
The Universe

Astrophysical tests of current values for dimensionless constants known on Earth, such as the fine-structure constant, α , and proton-to-electron mass ratio, μ = m p / m e , are communicated using data from high-resolution quasar spectra in different regions or epochs of the universe. The symmetry wavelengths of [Fe II] lines from redshifted quasar spectra of J110325-264515 and their corresponding values in the laboratory were combined to find a new limit on space-time variations in the proton-to-electron mass ratio, ∆ μ / μ = ( 0.096 ± 0.182 ) × 10 − 7 . The results show how the indicated astrophysical observations can further improve the accuracy and space-time variations of physics constants.

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