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Applied Physics B

, 123:2 | Cite as

Unexpectedly large difference of the electron density at the nucleus in the \( 4p\, ^2{\mathrm {P}}_{{1}/{2},{3}/{2}}\) fine-structure doublet of Ca\(^+\)

  • C. Shi
  • F. Gebert
  • C. Gorges
  • S. Kaufmann
  • W. Nörtershäuser
  • B. K. Sahoo
  • A. Surzhykov
  • V. A. Yerokhin
  • J. C. Berengut
  • F. Wolf
  • J. C. Heip
  • P. O. Schmidt
Article
Part of the following topical collections:
  1. “Enlightening the World with the Laser” - Honoring T. W. Hänsch

Abstract

We measured the isotope shift in the \(^2{\mathrm {S}}_{{1}/{2}}\) \(\rightarrow \) \(^2{\mathrm {P}}_{{3}/{2}}\) (D2) transition in singly ionized calcium ions using photon recoil spectroscopy. The high accuracy of the technique enables us to compare the difference between the isotope shifts of this transition to the previously measured isotopic shifts of the \(^2{\mathrm {S}}_{{1}/{2}}\) \(\rightarrow \) \(^2{\mathrm {P}}_{{1}/{2}}\) (D1) line. This so-called splitting isotope shift is extracted and exhibits a clear signature of field shift contributions. From the data, we were able to extract the small difference of the field shift coefficient and mass shifts between the two transitions with high accuracy. This J-dependence is of relativistic origin and can be used to benchmark atomic structure calculations. As a first step, we use several ab initio atomic structure calculation methods to provide more accurate values for the field shift constants and their ratio. Remarkably, the high-accuracy value for the ratio of the field shift constants extracted from the experimental data is larger than all available theoretical predictions.

Keywords

Isotope Shift Charge Radius Frequency Comb Field Shift Calcium Isotope 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We acknowledge financial support from the German Federal Ministry for Education and Research (BMBF) under contract 05P15RDFN1, the Helmholtz International Center for FAIR (HIC for FAIR) within the LOEWE program by the State of Hesse, the State of Lower Saxony, Hannover, Germany and DFG through grants SCHM2678/3-1 and CRC 1227 DQ-mat, project B05. SK received support from HGS-Hire. BKS acknowledges use of the Vikram-100 HPC cluster at the Physical Research Laboratory, Ahmedabad for performing calculations. V.A.Y acknowledges support by the Russian Federation program for organizing and carrying out scientific investigations. WN thanks G.W.F. Drake, Z.C. Yan, and R. Neugart for stimulating discussions. PS and WN thank K. Pachucki for stimulating discussions.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • C. Shi
    • 1
  • F. Gebert
    • 1
  • C. Gorges
    • 2
  • S. Kaufmann
    • 2
  • W. Nörtershäuser
    • 2
  • B. K. Sahoo
    • 3
  • A. Surzhykov
    • 1
    • 4
  • V. A. Yerokhin
    • 1
    • 5
  • J. C. Berengut
    • 6
  • F. Wolf
    • 1
  • J. C. Heip
    • 1
  • P. O. Schmidt
    • 1
    • 7
  1. 1.Physikalisch-Technische BundesanstaltBraunschweigGermany
  2. 2.Institut für KernphysikTechnische Universität DarmstadtDarmstadtGermany
  3. 3.Atomic, Molecular and Optical Physics DivisionPhysical Research LaboratoryAhmedabadIndia
  4. 4.Technische Universität BraunschweigBraunschweigGermany
  5. 5.Center for Advanced Studies, Peter the Great St. Petersburg Polytechnic UniversitySt. PetersburgRussia
  6. 6.School of PhysicsUniversity of New South WalesSydneyAustralia
  7. 7.Institut für QuantenoptikLeibniz Universität HannoverHannoverGermany

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