A5010811627- Atomic and Molecular Physics
- Nuclear physics research studies
- Radioactive Decay and Measurement Techniques
- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Mass Spectrometry Techniques and Applications
- Advanced Chemical Physics Studies
- Scientific Measurement and Uncertainty Evaluation
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Atomic and Subatomic Physics Research
- Quantum Chromodynamics and Particle Interactions
- Particle accelerators and beam dynamics
- Laser-induced spectroscopy and plasma
- Quantum Mechanics and Applications
- Analytical Chemistry and Sensors
- Quantum and electron transport phenomena
- Crystallography and Radiation Phenomena
- Neutrino Physics Research
- Electrical and Bioimpedance Tomography
- Advanced Fiber Laser Technologies
- Solid State Laser Technologies
- X-ray Spectroscopy and Fluorescence Analysis
- Quantum Information and Cryptography
Max Planck Institute for Nuclear Physics
2015-2025
Max Planck Society
2009-2017
Johannes Gutenberg University Mainz
2008-2013
Universität Greifswald
2009
European Organization for Nuclear Research
2007-2008
We determined the experimental value of g factor electron bound in hydrogenlike ²⁸Si¹³⁺ by using a single ion confined cylindrical Penning trap. From ratio ion's cyclotron frequency and induced spin flip frequency, we obtain = 1.995 348 958 7(5)(3)(8). It is excellent agreement with state-of-the-art theoretical 0(17), which includes QED contributions up to two-loop level order (Zα)² (Zα)⁴ represents stringent test bound-state quantum electrodynamics calculations.
We report on the precise measurement of atomic mass a single proton with purpose-built Penning-trap system. With precision 32 parts per trillion our result not only improves current CODATA literature value by factor 3, but also disagrees it at level about 3 standard deviations.
Abstract Quantum electrodynamics (QED) is one of the most fundamental theories physics and has been shown to be in excellent agreement with experimental results 1–5 . In particular, measurements electron’s magnetic moment (or g factor) highly charged ions Penning traps provide a stringent probe for QED, which allows testing standard model strongest electromagnetic fields 6 When studying differences between isotopes, many common QED contributions cancel owing identical electron configuration,...
Inner-shell electrons naturally sense the electric field close to nucleus, which can reach extreme values beyond 1015 V cm-1 for innermost electrons1. Especially in few-electron, highly charged ions, interaction with electromagnetic fields be accurately calculated within quantum electrodynamics (QED), rendering these ions good candidates test validity of QED strong fields. Consequently, their Lamb shifts were intensively studied past several decades2,3. Another approach is measurement...
Using a phase-detection method to determine the cyclotron frequency of single trapped ion in Penning trap allowed us perform measurement $g$ factor bound electron hydrogenlike ${}^{28}$Si${}^{13+}$ with statistical uncertainty $4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}$. Furthermore, we reevaluated image-charge shift as main source uncertainty. Our result challenges bound-state quantum-electrodynamical calculations by probing two-loop contributions order...
The $g$ factor of lithiumlike silicon $^{28}\mathrm{Si}^{11+}$ has been measured in a triple-Penning trap with relative uncertainty $1.1\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ to be ${g}_{\mathrm{exp}}=2.000\text{ }889\text{ }9(21)$. theoretical prediction for this value was calculated ${g}_{\mathrm{th}}=2.000\text{ }909(51)$ improving the accuracy $2.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$ due first rigorous evaluation two-photon exchange correction. is...
Abstract The magnetic moment μ of a bound electron, generally expressed by the g -factor =− B s ħ −1 with Bohr magneton and electron’s spin, can be calculated bound-state quantum electrodynamics (BS-QED) to very high precision. recent ultra-precise experiment on hydrogen-like silicon determined this value eleven significant digits, thus allowed rigorously probe validity BS-QED. Yet, investigation one most interesting contribution -factor, relativistic interaction between electron nucleus, is...
Electron beam ion traps (EBITs) are ideal tools for both production and study of highly charged ions (HCIs). In order to reduce their construction, maintenance, operation costs, we have developed a novel, compact, room-temperature design, the Heidelberg Compact EBIT (HC-EBIT). Four already commissioned devices operate at strongest fields (up 0.86 T) reported such EBITs using permanent magnets, run electron currents up 80 mA, energies 10 keV. They demonstrate HCI production, trapping,...
A novel technique for a direct and coherent measurement of the modified cyclotron frequency an ion in Penning trap at energies close to thermal cooling limit is presented. This allows rapid both precise accurate determination free-space real traps despite existence electric magnetic field imperfections relativistic shifts. The demonstrated performance paves way considerably improved bound-state g-factor measurements on 10 ppt level mass 1 range possibly below.
The electron mass in atomic units has been determined with a relative uncertainty of (Sturm et al 2014 Nature 506 467–70), which represents 13-fold improvement the 2010 CODATA value (Mohr 2012 Rev. Mod. Phys. 84 1527–605). underlying measurement principle combines high-precision Larmor-to-cyclotron frequency ratio on single hydrogen-like carbon ion Penning trap corresponding very accurate g-factor calculation. Here, we present results detail, including comprehensive discussion systematic...
We have measured the ground-state $g$ factor of boronlike argon ${^{40}\mathrm{Ar}}^{13+}$ with a fractional uncertainty $1.4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}9}$ single ion in newly developed Alphatrap double Penning-trap setup. The value $g=0.663\text{ }648\text{ }455\text{ }32(93)$ obtained here is agreement our theoretical prediction 0.663 648 12(58). latter accounting for quantum electrodynamics, electron correlation, and nuclear effects within state-of-the-art...
The determination of the electron mass from Penning-trap measurements with $^{12}$C$^{5+}$ ions and theoretical results for bound-electron $g$ factor is described in detail. Some recently calculated contributions slightly shift extracted value. Prospects a further improvement are discussed both experimental point view. Measurements $^4$He$^+$ will enable consistency check value, future an $^4$He nuclear fine-structure constant.
The ALPHATRAP experiment at the Max-Planck Institute for Nuclear Physics in Heidelberg aims probing validity of quantum electrodynamics extremely strong electromagnetic fields. To this end, will determine value magnetic moment, or g-factor, electron bound highly charged ions. Quantum predicts with extraordinary precision. As ions is exposed to strongest fields available high-precision spectroscopy laboratory, reaching up 1016 V/cm hydrogenlike lead 208Pb81+, a comparison theoretical...
Highly charged ions represent environments that allow to study precisely one or more bound electrons subjected unsurpassed electromagnetic fields. Under such conditions, the magnetic moment (g-factor) of a electron changes significantly, large extent due contributions from quantum electrodynamics. We present three Penning-trap experiments, which measure moments with ppb precision and better, serving as stringent tests corresponding calculations, also yielding access fundamental quantities...
The precise knowledge of the atomic masses light nuclei, e.g. proton, deuteron, triton and helion, is great importance for several fundamental tests in physics. However, latest high-precision measurements these carried out at different mass spectrometers indicate an inconsistency five standard deviations. To determine lightest ions with a relative precision few parts per trillion investigate this problem cryogenic multi-Penning trap setup, LIONTRAP (Light ION TRAP), was constructed. This...
We report on the successful demonstration of a novel scheme for detecting optical transitions in highly charged ions. applied it to determine frequency dipole-forbidden $2p\text{ }{^{2}P}_{1/2}\ensuremath{-}{^{2}P}_{3/2}$ transition fine structure ${^{40}\mathrm{Ar}}^{13+}$ using single ion stored harmonic potential Penning trap. Our measurement does not require detection fluorescence, instead makes use continuous Stern-Gerlach effect. value...
The highest precision in the determination of nuclear and atomic masses can be achieved by Penning trap mass spectrometry. value is obtained through a measurement cyclotron frequency stored charged particle. Two different approaches are used at spectrometer TRIGA-TRAP for determination: destructive Time-Of-Flight Ion Cyclotron Resonance (TOF-ICR) technique non-destructive Fourier Transform (FT-ICR) method. New developments both techniques described, which will improve detection efficiency...
The recently established agreement between experiment and theory for the $g$ factors of lithiumlike silicon calcium ions manifests most stringent test many-electron bound-state quantum electrodynamics (QED) effects in presence a magnetic field. In this Letter, we present significant simultaneous improvement both theoretical ${g}_{\mathrm{th}}=2.000\text{ }889\text{ }894\text{ }4\text{ }(34)$ experimental ${g}_{\mathrm{exp}}=2.000\text{ }888\text{ }45\text{ }(14)$ values factor...