A5012465453- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Mechanics and Applications
- Noncommutative and Quantum Gravity Theories
- Quantum Mechanics and Non-Hermitian Physics
- Quantum Electrodynamics and Casimir Effect
- Laser-Matter Interactions and Applications
- Atomic and Subatomic Physics Research
- Particle physics theoretical and experimental studies
- Scientific Measurement and Uncertainty Evaluation
- Nuclear physics research studies
- Quantum chaos and dynamical systems
- Spectroscopy and Laser Applications
- Quantum and Classical Electrodynamics
- Quantum Chromodynamics and Particle Interactions
- Quantum, superfluid, helium dynamics
- Advanced Frequency and Time Standards
- Quantum Information and Cryptography
- Spectroscopy and Quantum Chemical Studies
- Neutrino Physics Research
- Black Holes and Theoretical Physics
- Cosmology and Gravitation Theories
- Quantum optics and atomic interactions
- Radioactive Decay and Measurement Techniques
Missouri University of Science and Technology
2016-2025
HUN-REN Institute for Nuclear Research
2018-2023
Institute for Particle and Nuclear Physics
2013-2022
Stockholm University
2022
KTH Royal Institute of Technology
2022
Max Planck Institute for Nuclear Physics
2003-2019
National Institute of Standards and Technology
2002-2015
Hungarian Academy of Sciences
1997-2013
Heidelberg Institute for Theoretical Studies
2007-2012
Heidelberg University
2008-2012
We have remeasured the absolute $1S$-$2S$ transition frequency ${\ensuremath{\nu}}_{\mathrm{H}}$ in atomic hydrogen. A comparison with result of previous measurement performed 1999 sets a limit $(\ensuremath{-}29\ifmmode\pm\else\textpm\fi{}57)\text{ }\mathrm{Hz}$ for drift respect to ground state hyperfine splitting ${\ensuremath{\nu}}_{\mathrm{Cs}}$ $^{133}\mathrm{Cs}$. Combining this recently published optical $^{199}\mathrm{Hg}^{+}$ against and microwave $^{87}\mathrm{Rb}$...
We present a Reply to the Comment by G. L. Klimchitskaya, arXiv:2501.14803 [physics.atom-ph]. It is shown that criticism formulated in fails appreciate recently obtained results for upper limit of short-range expansion atom-surface interactions, and application our physisorption based on valid extension Lifshitz theory range, which can be accomplished refining concept distance with help reference-plane takes response function solid into account. Some details calculation are recalled from literature.
Usually, photons are described by plane waves with a definite 4-momentum. In addition to plane-wave photons, "twisted photons" have recently entered the field of modern laser optics; these coherent superpositions defined projection hm orbital angular momentum onto propagation axis, where m is an integer. this Letter, we show that it possible produce high-energy twisted Compton backscattering off ultrarelativistic electrons. Such may be interest for experiments related excitation and...
Within a systematic approach based on dimensionally regularized nonrelativistic quantum electrodynamics, we derive complete result for the two-loop correction to order ${(\ensuremath{\alpha}∕\ensuremath{\pi})}^{2}{(Z\ensuremath{\alpha})}^{4}$ $g$ factor of an electron bound in $nS$ state hydrogenlike ion. The results obtained significantly improve accuracy theoretical predictions carbon and oxygen ions influence value mass inferred from $g$-factor measurements.
Measuring the hydrogen-deuterium isotope shift via two-photon spectroscopy of 1S-2S transition, we obtain 670,994,334,606(15) Hz. This is a 10-times improvement over previous best measurement [A. Huber, Phys. Rev. Lett. 80, 468 (1998)] confirming its frequency value. A calculation difference mean square charge radii deuterium and hydrogen results in <r2>d - <r2>p =3.82007(65) fm2, more than twofold compared to former
Isotope shifts in dielectronic recombination spectra were studied for Li-like (A)Nd(57+) ions with A=142 and A=150. From the displacement of resonance positions energy deltaE(142 150)(2s-2p(1/2))=40.2(3)(6) meV [(stat)(sys)] 150)(2s-2p(3/2))=42.3(12)(20) 2s-2p(j) transitions deduced. An evaluation these values within a full QED treatment yields change mean-square charge radius (142 150)deltar(2)=-1.36(1)(3) fm(2). The approach is conceptually new combines advantage simple atomic structure...
We revisit the derivation of multipole contributions to atom-wall interaction previously presented in \L{}ach et al. [G. \L{}ach, M. DeKieviet, and U. D. Jentschura, Phys. Rev. A 81, 052507 (2010)]. careful reconsideration angular momentum decomposition second-, third-, fourth-rank tensors composed derivatives electric-field modes leads a modification for results quadrupole, octupole, hexadecupole interaction. Asymptotic are given asymptotic long-range forms terms, both short-range limits....
We present a nonperturbative numerical evaluation of the one-photon electron self energy for hydrogenlike ions with low nuclear charge numbers Z=1 to 5. Our calculation 1S state has uncertainty 0.8 Hz hydrogen and 13 singly-ionized helium. Resummation convergence acceleration techniques that reduce computer time by about three orders magnitude were employed in calculation. The results are compared based on known terms expansion powers (Z alpha).
We present an improved calculation of higher-order corrections to the one-loop self-energy 2P states in hydrogenlike systems with small nuclear charge Z. The method is based on a division integration respect photon energy into high- and low-energy part. high-energy part calculated by expansion electron propagator powers Coulomb field. simplified application Foldy-Wouthuysen transformation. This transformation leads clear separation leading contribution from relativistic removes terms....
We calculate the one- and two-loop corrections of order $\ensuremath{\alpha}{(Z\ensuremath{\alpha})}^{6}$ ${\ensuremath{\alpha}}^{2}{(Z\ensuremath{\alpha})}^{6}$, respectively, to Lamb shift in hydrogenlike systems using formalism nonrelativistic quantum electrodynamics. obtain general results valid for all hydrogenic states with nonvanishing orbital angular momentum normalized difference $S$ states. These involve expectation value local effective operators relativistic Bethe logarithms. The...
Three-loop electronic vacuum-polarization corrections due to irreducible diagrams are evaluated for two-body muonic ions with nuclear charge numbers <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mn>1</a:mn><a:mo>≤</a:mo><a:mi>Z</a:mi><a:mo>≤</a:mo><a:mn>6</a:mn></a:math>. The of order <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi>α</c:mi><c:mn>3</c:mn></c:msup><c:mo...
We propose a measurement of laser-induced vacuum birefringence through the use pulsed lasers coupled to femtosecond optical enhancement cavities. This technique features cavity-enhanced pump and probe pulses, as well an independent control pulse. The pulse allows for differential where final signal is obtained using high-frequency lock-in detection, greatly mitigating time-dependent cavity important possibly prohibitive systematic effect. In addition, method economical laser power results in...
We calculate the two-loop Bethe logarithm correction to atomic energy levels in hydrogenlike systems. The is a low-energy quantum electrodynamic (QED) effect involving multiple summations over virtual excited states. Although much smaller absolute magnitude than well-known one-loop logarithm, analog quite significant when compared current experimental accuracy of 1S-2S transition: It contributes -8.19 and -0.84 kHz for 1S 2S state, respectively. has been largest unknown hydrogen Lamb shift...
The lifetime of the ${\mathrm{Ar}}^{13+}$ $1{s}^{2}2{s}^{2}2p\text{ }^{2}P_{3/2}^{o}$ metastable level was determined at Heidelberg Electron Beam Ion Trap to be $9.573(4)(5)\text{ }\text{ }\mathrm{ms}(\mathrm{stat})(\mathrm{syst})$. accuracy one per thousand makes this measurement sensitive quantum electrodynamic effects like electron anomalous magnetic moment (EAMM) and relativistic electron-electron correlation frequency-dependent Breit interaction. Theoretical predictions, adjusted for...
One of the dominant systematic effects that shift resonance lines in high-precision measurements two-photon transitions is dynamic (ac) Stark shift. For suitable laser frequencies, ac acquires an imaginary part which corresponds to rate resonant one-photon ionization electrons into a continuum state. At current level spectroscopic accuracy, underlying time-dependent quantum dynamics governing atomic excitation process must be well understood, and related considerations are subject present...