A5012262670- Atomic and Molecular Physics
- Mass Spectrometry Techniques and Applications
- Laser-induced spectroscopy and plasma
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Frequency and Time Standards
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear physics research studies
- Advanced Chemical Physics Studies
- Laser-Matter Interactions and Applications
- Ion-surface interactions and analysis
- Atomic and Subatomic Physics Research
- Scientific Measurement and Uncertainty Evaluation
- Particle accelerators and beam dynamics
- Nuclear Physics and Applications
- Electron and X-Ray Spectroscopy Techniques
- Advanced X-ray Imaging Techniques
- Radioactive Decay and Measurement Techniques
- Diamond and Carbon-based Materials Research
- Advanced Fiber Laser Technologies
- Laser-Plasma Interactions and Diagnostics
- Integrated Circuits and Semiconductor Failure Analysis
- Quantum optics and atomic interactions
- Magnetic confinement fusion research
- Stellar, planetary, and galactic studies
- Analytical Chemistry and Sensors
Max Planck Institute for Nuclear Physics
2015-2024
European Organization for Nuclear Research
2024
Physikalisch-Technische Bundesanstalt
2021
Wuhan Institute of Physics and Mathematics
2021
Chinese Academy of Sciences
2021
Max Planck Society
2008-2020
Petersburg Nuclear Physics Institute
2018
Kurchatov Institute
2018
UNSW Sydney
2017
Lawrence Livermore National Laboratory
1996-2016
Recent developments in frequency metrology and optical clocks have been based on electronic transitions atoms singly charged ions as references. These systems enabled relative uncertainties at a level of few parts $10^{-18}$. This accomplishment not only allows for extremely accurate time measurements, but also to probe our understanding fundamental physics, such variation constants, violation the local Lorentz invariance, forces beyond Standard Model Physics. In addition, novel are driving...
Vector momentum distributions of two electrons created in double ionization Ar by 25 fs, 0.25 PW/cm(2) laser pulses at 795 nm have been measured using a "reaction microscope." At this intensity, where nonsequential dominates, distinct correlation patterns are observed the two-electron distributions. A kinematical analysis these spectra within classical "recollision model" revealed an (e,2e)-like process and excitation with subsequent tunneling second electron as different mechanisms. This...
Control over the motional degrees of freedom atoms, ions, and molecules in a field-free environment enables unrivalled measurement accuracies but has yet to be applied highly charged ions (HCIs), which are particular interest future atomic clock designs searches for physics beyond Standard Model. Here, we report on Coulomb crystallization HCIs (specifically (40)Ar(13+)) produced an electron beam ion trap retrapped cryogenic linear radiofrequency by means sympathetic cooling through...
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...
A measurement of the ${2s}_{1/2}\ensuremath{-}{2p}_{3/2}$ x-ray transition in trapped Li-like ${\mathrm{Bi}}^{80+}$ ions was made that resolved $0.820\ifmmode\pm\else\textpm\fi{}0.026\mathrm{eV}$ hyperfine splitting $({1s}^{2}2s{)}_{F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4,5}$ ground configuration, providing first such a multielectron highly charged ion. The intensity ratio two components is shown to be new electron density diagnostic. statistically averaged...
Electron emission for single ionization of Ne by 25 fs, 1.0 PW/cm(2) laser pulses at 800 nm has been investigated in a kinematically complete experiment using "reaction microscope." Mapping the final state momentum space with high resolution, distinct local minimum is observed P(e parallel )=0, where ) electron to polarization. Whereas tunneling theory predicts maximum zero momentum, our findings are good agreement recent semiclassical predictions which were interpreted be due "recollision."
We report the first direct laboratory measurement of spontaneous emission due to hyperfine splitting ground state a highly charged hydrogenlike ion excited by electron collisions. The transition between $F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}4$ and $F\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}3$ levels $1s^{2}S_{1/2}$ configuration $^{165}H{o}^{65+}$ was observed its wavelength determined $5726.4\ifmmode\pm\else\textpm\fi{}1.5\AA{}$. After taking into account...
We present the results of an experimental study magnetic dipole (M1) transitions in highly charged argon ions (Ar X, Ar XI, XIV, XV) visible spectral range using electron beam ion trap. Their wavelengths were determined with, for ions, unprecedented accuracy up to sub-ppm level and compared with theoretical calculations. The QED contributions, calculated this Letter, are found be 4 orders magnitude larger than error absolutely indispensable bring theory experiment a good agreement. This...
The isotope shifts of forbidden transitions in Be- and B-like argon ions are calculated. It is shown that only using the relativistic recoil operator can provide a proper evaluation mass shift, which strongly dominates over field shift for under consideration. Comparing calculated with current experimental uncertainties indicates very good perspectives first test theory effect middle-$Z$ ions.
In a proof-of-principle experiment, we demonstrate high-resolution resonant laser excitation in the soft x-ray region at 48.6 eV of 2 $^{2}S_{1/2}$ to $^{2}P_{1/2}$ transition Li-like ${\mathrm{Fe}}^{23+}$ ions trapped an electron beam ion trap by using ultrabrilliant light from Free Electron Laser Hamburg (FLASH). High precision spectroscopic studies highly charged this and upcoming lasers with expected accuracy gain up factor thousand, become possible our technique, thus potentially...
TRIUMF's Ion Trap for Atomic and Nuclear science (TITAN) constitutes the only high precision mass measurement setup coupled to a rare isotope facility capable of increasing charge state short-lived nuclides prior actual determination in Penning trap. Recent developments around TITAN's breeder, electron beam ion trap, form basis several successful experiments on radioactive isotopes with half-lives as low 65 ms states 22+.
We measure optical spectra of Nd-like W, Re, Os, Ir, and Pt ions particular interest for studies a possibly varying fine-structure constant. Exploiting characteristic energy scalings we identify the strongest lines, confirm predicted 5s-4f level crossing, benchmark advanced calculations. infer two possible values M2/E3 E1 transitions in Ir^{17+} that have highest sensitivity to variation constant among stable atomic systems. Furthermore, determine energies proposed frequency standards...
Photoabsorption by and fluorescence of the $K\ensuremath{\alpha}$ transitions in highly charged iron ions are essential mechanisms for x-ray radiation transfer astrophysical environments. We study photoabsorption due to main from heliumlike fluorinelike (${\mathrm{Fe}}^{24+}$ ${\mathrm{Fe}}^{17+}$) using monochromatic x rays around 6.6 keV at PETRA III synchrotron photon source. Natural linewidths were determined with hitherto unattained accuracy. The observed particular interest...
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,...
Abstract The detection of variations fundamental constants the Standard Model would provide us with compelling evidence new physics, and could lift veil on nature dark matter energy. In this work, we discuss how a network atomic molecular clocks can be used to look for such unprecedented sensitivity over wide range time scales. This is precisely goal recently launched QSNET project: A measuring stability constants. will include state-of-the-art clocks, but also develop next-generation highly...
The last decade has seen unprecedented effort in dark matter model building at all mass scales coupled with the design of numerous new detection strategies. Transformative advances quantum technologies have led to a plethora high-precision sensors and strategies for ultralight ($<10\,$eV) bosonic that can be described by an oscillating classical, largely coherent field. This white paper focuses on searches wavelike scalar vector candidates.
We used the monochromatic soft-x-ray beamline P04 at synchrotron-radiation facility PETRA III to resonantly excite strongest $2p-3d$ transitions in neon-like Ni XIX ions, $[2p^6]_{J=0} \rightarrow [(2p^5)_{1/2}\,3d_{3/2}]_{J=1}$ and [(2p^5)_{3/2}\,3d_{5/2}]_{J=1}$, respectively dubbed 3C 3D, achieving a resolving power of 15\,000 signal-to-background ratio 30. obtain their natural linewidths, with an accuracy better than 10\%, as well oscillator-strength $f(3C)/f(3D)$ = 2.51(11) from...
Abstract We improve by a factor of 4–20 the energy accuracy strongest soft X-ray transitions Fe xvii ions resonantly exciting them in an electron beam ion trap with monochromatic at P04 beamline PETRA III synchrotron facility. By simultaneously tracking instantaneous photon-energy fluctuations high-resolution photoelectron spectrometer, we minimize systematic uncertainties down to 10–15 meV, or velocity equivalent ±∼5 km s −1 their rest energies, substantially improving our knowledge this...