Journal article

Testing Three-Body Quantum Electrodynamics with Trapped Ti20 Ions: Evidence for a Z-dependent Divergence Between Experiment and Calculation

CT Chantler, MN Kinnane, JD Gillaspy, LT Hudson, AT Payne, LF Smale, A Henins, JM Pomeroy, JN Tan, JA Kimpton, E Takacs, K Makonyi

PHYSICAL REVIEW LETTERS | AMER PHYSICAL SOC | Published : 2012

Abstract

We report a new test of quantum electrodynamics (QED) for the w (1s2p(1)P(1)→1s(2)(1)S(0)) x-ray resonance line transition energy in heliumlike titanium. This measurement is one of few sensitive to two-electron QED contributions. Systematic errors such as Doppler shifts are minimized in our experiment by trapping and stripping Ti atoms in an electron beam ion trap and by applying absolute wavelength standards to calibrate the dispersion function of a curved-crystal spectrometer. We also report a more general systematic discrepancy between QED theory and experiment for the w transition energy in heliumlike ions for Z>20. When all of the data available in the literature for Z=16-92 are taken i..

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University of Melbourne Researchers

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Funding Acknowledgements

We thank Jonathan Sapirstein, Anton Artemyev, Vladimir Shabaev, Peter Mohr, and Gordon Drake for helpful discussions and Yuri Ralchenko for collisional-radiative modeling. We also acknowledge support from the Australian Research Council.