432 citations · 5.7k across the 212 of their papers we have counts for
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Precision Spectroscopy of 2S-nS Transitions in Atomic Hydrogen: A Determination of the Proton Charge Radius
R. G. Bullis, W. L. Tavis, M. R. Weiss +4
We present absolute frequency measurements of 2S_{1/2}-nS_{1/2} two-photon transitions with n = 8, 9, and 10 in a cryogenic beam of atomic hydrogen. Each transition has been measur…
Binding Energy of Muonic Beryllium: Perturbative versus All--Order Calculations
Shikha Rathi, Ulrich D. Jentschura, Paul Indelicato +1
We compute the ground-state binding energy of muonic Be in two ways: first, the fully perturbative treatment of the nuclear-size effect often employed in light systems, and sec…
Tensor Polarizability of the Nucleus and Angular Mixing in Muonic Deuterium
G. S. Adkins, U. D. Jentschura
We investigate the effects of the tensor polarizability of a nucleus on the bound-state energy levels, and obtain a general formula for the contribution of the tensor polarizabilit…
Short-Range Hard-Sphere Potential and Coulomb Interaction: Deser-Trueman Formula for Rydberg States of Exotic Atomic Systems
G. S. Adkins, U. D. Jentschura
In exotic atomic systems with hadronic constituent particles, it is notoriously difficult to estimate the strong-interaction correction to energy levels. It is well known that, due…
Reply to Comment on "Revisiting the divergent multipole expansion of atom-surface interactions: Hydrogen and positronium, alpha-quartz, and physisorption" (arXiv:2501.14803)
Ulrich D. Jentschura
We present a Reply to the Comment by G. L. Klimchitskaya, arXiv:2501.14803 [physics.atom-ph]. It is shown that the criticism formulated in the Comment fails to appreciate recently…
Eighth-Order Foldy-Wouthuysen Transformation
Ulrich D. Jentschura
The calculation of higher-order binding corrections to bound systems is a fundamental problem of theoretical physics. For any nonrelativistic expansion, one needs the Foldy-Wouthuy…
Precision Rydberg State Spectroscopy with Slow Electrons and Proton Radius Puzzle
Ulrich D. Jentschura, Dylan C. Yost
The so-called proton radius puzzle (the current discrepancy of proton radii determined from spectroscopic measurements in ordinary versus muonic hydrogen) could be addressed via an…
Revisiting the Divergent Multipole Expansion of Atom-Surface Interactions: Hydrogen and Positronium, alpha-Quartz, and Physisorption
Ulrich D. Jentschura
We revisit the derivation of multipole contributions to the atom-wall interaction previously presented in [G. Lach et al., Phys. Rev. A 81, 052507 (2010)]. A careful reconsideratio…
Proton Radius: A Puzzle or a Solution!?
Ulrich D. Jentschura
The proton radius puzzle is known as the discrepancy of the proton radius, obtained from muonic hydrogen spectroscopy (obtained as being roughly equal to 0.84fm), and the proton ra…
Foldy-Wouthuysen Transformation in Strong Magnetic Fields and Relativistic Corrections for Quantum Cyclotron Energy Levels
A. Wienczek, C. Moore, U. D. Jentschura
We carry out a direct, iterative Foldy--Wouthuysen transformation of a general Dirac Hamiltonian coupled to an electromagnetic field, including the anomalous magnetic moment. The t…
Quantum Electrodynamics of Dicke States: Resonant One-Photon Exchange and Entangled Decay Rate
U. D. Jentschura, C. M. Adhikari
We calculate the one-photon exchange contribution to the interatomic interaction potential between electrically neutral, identical atoms, one of which is assumed to be in an excite…
Pressure Shifts in High-Precision Hydrogen Spectroscopy: I. Long-Range Atom-Atom and Atom-Molecule Interactions
U. D. Jentschura, C. M. Adhikari, R. Dawes +2
We study the theoretical foundations for the pressure shifts in high-precision atomic beam spectrosopy of hydrogen, with a particular emphasis on transitions involving higher excit…
Pressure Shifts in High-Precision Hydrogen Spectroscopy: II. Impact Approximation and Monte-Carlo Simulations
A. Matveev, N. Kolachevsky, C. M. Adhikari +1
We investigate collisional shifts of spectral lines involving excited hydrogenic states, where van der Waals coefficients have recently been shown to have large numerical values wh…
Close Examination of the Ground-State Casimir-Polder Interaction: Time-Ordered Versus Covariant Formalism and Radiative Corrections
C. M. Adhikari, U. D. Jentschura
The purpose of this paper is twofold. First, we compare, in detail, the derivation of the Casimir-Polder interaction using time-ordered perturbation theory, to the matching of the…
Resonance strengths for KLL dielectronic recombination of highly charged mercury ions and improved empirical -scaling law
Zoltán Harman, Chintan Shah, Antonio J. González-Martínez +5
Theoretical and experimental resonance strengths for KLL dielectronic recombination (DR) into He-, Li-, Be-, and B-like mercury ions are presented, based on state-resolved DR x-ray…
Relativistic and Radiative Corrections to the Dynamic Stark Shift: Gauge Invariance and Transition Currents in the Velocity Gauge
U. D. Jentschura, C. M. Adhikari
We investigate the gauge invariance of the dynamic (ac) Stark shift under "hybrid" gauge transformations from the "length" (E.r) to the "velocity" (A.p) gauge. By a "hybrid" gauge…
Long-Range Interactions for Hydrogen: 6P-1S and 6P-2S
U. D. Jentschura, C. M. Adhikari
The collisional shift of a transition constitutes an important systematic effect in high-precision spectroscopy. Accurate values for van der Waalsinteraction coefficients are requi…
Long-range interactions of hydrogen atoms in excited states. III. nS-1S interactions for n >= 3
C. M. Adhikari, V. Debierre, U. D. Jentschura
The long-range interaction of excited neutral atoms has a number of interesting and surprising properties, such as the prevalence of long-range, oscillatory tails, and the emergenc…
Long-range interactions of hydrogen atoms in excited states. II. Hyperfine-resolved 2S-2S system
U. D. Jentschura, V. Debierre, C. M. Adhikari +2
The interaction of two excited hydrogen atoms in metastable states constitutes a theoretically interesting problem because of the quasi-degenerate 2P_{1/2} levels which are removed…
Long-range interactions of hydrogen atoms in excited states. I. 2S-1S interactions and Dirac-delta perturbations
C. M. Adhikari, V. Debierre, A. Matveev +2
The theory of the long-range interaction of metastable excited atomic states with ground-state atoms is analyzed. We show that the long-range interaction is essentially modified wh…
Magic wavelength for the hydrogen 1S-2S transition: Contribution of the continuum and the reduced-mass correction
C. M. Adhikari, A. Kawasaki, U. D. Jentschura
Recently, we studied the magic wavelength for the atomic hydrogen 1S-2S transition [A.K., Phys. Rev. A 92, 042507 (2015)]. An explicit summation over virtual atomic states of the d…
From First Principles of QED to an Application: Hyperfine Structure of P States of Muonic Hydrogen
U. D. Jentschura
The purpose of this article is twofold. First, we attempt to give a brief overview of the different application areas of quantum electrodynamics (QED). These include fundamental ph…
Light Sea Fermions in Electron-Proton and Muon-Proton Interactions
U. D. Jentschura
The proton radius conundrum [R. Pohl et al., Nature vol.466, p.213 (2010) and A. Antognini et al., Science vol.339, p.417 (2013)] highlights the need to revisit any conceivable sou…
Thermal Correction to the Molar Polarizability of a Boltzmann Gas
U. D. Jentschura, M. Puchalski, P. J. Mohr
Metrology in atomic physics has been crucial for a number of advanced determinations of fundamental constants. In addition to very precise frequency measurements, the molar polariz…