Journal ArticleDOI
High Precision Wavelength Measurements of QED-Sensitive Forbidden Transitions in Highly Charged Argon Ions
I. Draganic,J. R. Crespo López-Urrutia,R. DuBois,Stephan Fritzsche,V. M. Shabaev,R. Soria Orts,I. I. Tupitsyn,Y. Zou,Joachim Ullrich +8 more
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TLDR
An experimental study of magnetic dipole (M1) transitions in highly charged argon ions in the visible spectral range using an electron beam ion trap shows great potential for the study of QED effects in relativistic few-electron systems.Abstract:
We present the results of an experimental study of magnetic dipole ($M1$) transitions in highly charged argon ions (Ar X, Ar XI, Ar XIV, Ar XV) in the visible spectral range using an electron beam ion trap. Their wavelengths were determined with, for highly charged ions, unprecedented accuracy up to the sub-ppm level and compared with theoretical calculations. The QED contributions, calculated in this Letter, are found to be 4 orders of magnitude larger than the experimental error and are absolutely indispensable to bring theory and experiment to a good agreement. This method shows great potential for the study of QED effects in relativistic few-electron systems.read more
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Highly charged ions: Optical clocks and applications in fundamental physics
TL;DR: In this article, a review discusses how a variety of ion species and transitions may optimally be used to target new applications, and presents routes to handle them in the laboratory, as well as how to handle ion species for precision spectroscopy and accurate clocks.
Journal ArticleDOI
The Solar Corona
TL;DR: Theysics of the Solar Corona by I. S. Shklovskii and L. A. Meadows as discussed by the authors was published in 1965 and translated by L. Fenn and A. J. Meadows.
Journal ArticleDOI
Energy Levels and Observed Spectral Lines of Ionized Argon, Ar II through Ar XVIII
TL;DR: In this paper, the energy levels and spectral lines of ionized argon atoms, in all stages of ionization, have been compiled, and sufficient experimental data were found to generate level and line tables for Ar II through Ar XV.
Journal ArticleDOI
QEDMOD: Fortran program for calculating the model Lamb-shift operator
TL;DR: Fortran package QEDMOD is presented for computing the model QED operator hQED that can be used to account for the Lamb shift in accurate atomic-structure calculations, and routines calculate the matrix elements of hZED with the user-specified one-electron wave functions.
Journal ArticleDOI
MATS and LaSpec: High-precision experiments using ion traps and lasers at FAIR
Daniel Rodríguez,Klaus Blaum,Wilfried Nörtershäuser,M. Ahammed,A. Algora,Georges Audi,Juha Äystö,D. Beck,Michaël Bender,J. Billowes,Michael Block,Christine Böhm,Georg Bollen,M. Brodeur,T. Brunner,Bruce A. Bushaw,R. B. Cakirli,Paul Campbell,D. Cano-Ott,G. Cortes,J. R. Crespo López-Urrutia,P. Das,Andreas Dax,A. De,P. P. J. Delheij,T. Dickel,Jens Dilling,Klaus Eberhardt,Sergey Eliseev,S. Ettenauer,Kieran Flanagan,Rafael Ferrer,J. E. García-Ramos,E. Gartzke,Hans Geissel,Sebastian George,Christopher Geppert,M.B. Gómez-Hornillos,Yu. I. Gusev,Dietrich Habs,Paul-Henri Heenen,S. Heinz,F. Herfurth,Alexander Herlert,Matthias Hobein,G. Huber,Marc Huyse,C. Jesch,Ari Jokinen,Oliver Kester,Jens Ketelaer,Veli Kolhinen,I. Koudriavtsev,Magdalena Kowalska,J. Krämer,Susanne Kreim,A. Krieger,T. Kühl,Antonio M. Lallena,Alain Lapierre,F. Le Blanc,Yu. A. Litvinov,David Lunney,T. Martinez,Gerrit Marx,M. Matos,E. Minaya-Ramirez,Iain Moore,Sz. Nagy,S. Naimi,Dennis Neidherr,Dmitrii Nesterenko,Gerda Neyens,Y. Novikov,M. Petrick,Wolfgang R. Plaß,A. Popov,Wolfgang Quint,A. Ray,Paul-Gerhard Reinhard,Julia Repp,C. Roux,B. Rubio,Rodolfo Sánchez,Birgit Schabinger,C. Scheidenberger,D. H. Schneider,R. Schuch,S. Schwarz,Lutz Schweikhard,M. D. Seliverstov,Andreas Solders,Markus Suhonen,J. Szerypo,J. L. Tain,P. G. Thirolf,Joachim Ullrich,P. Van Duppen,Andrey Vasiliev,G. Vorobjev,C. Weber,Klaus Wendt,M. Winkler,Deyan T. Yordanov,F. Ziegler +104 more
TL;DR: In this article, the authors proposed a method for high-accuracy mass measurements of the shortest-lived isotopes and decay studies at the FAIR facility using an electron beam ion trap for charge breeding, ion traps for beam preparation, and a high-precision Penning trap system for mass measurements and decay analysis.
References
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Journal ArticleDOI
The lamb shift in hydrogen-like atoms, 1 ⩽ Z ⩽ 110
TL;DR: Theoretical energy levels and energy-level separations for n = 1 and n = 2 states of hydrogen-like atoms with nuclear charge numbers in the range 1 ⩽ Z⩽ 110 are tabulated in this paper.
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The primordial helium abundance: systematic effects and a new determination
Yuri I. Izotov,Yuri I. Izotov,Trinh X. Thuan,Trinh X. Thuan,Valentin A. Lipovetsky,Valentin A. Lipovetsky +5 more
TL;DR: In this paper, the primordial helium abundance was determined for 27 supergiant H II regions in 23 low-metallicity blue compact galaxies (BCGs) with oxygen abundance 12 + log (O/H) between 7.22 and 8.51.
Journal ArticleDOI
Electric Dipole, Quadrupole, and Magnetic Dipole Transition Probabilities of Ions Isoelectronic to the First-Row Atoms, Li through F
TL;DR: Theoretical wavelengths, oscillator strengths, line strengths, and transition probabilities for the E1, M1, and E2 transitions among states with 2sn2pm configurations are presented for ions isoelectronic to the first-row atoms (Li through F) in this paper.
Journal ArticleDOI
Wavelengths and Energy Levels of Ar I and Ar II based on New Interferometric Measurements in the Region 3 400-9 800 Å
TL;DR: In this paper, a Fabry-Perot interferometer was used to measure the wavelengths of 233 lines in the Ar I spectrum and 354 lines in Ar II spectrum, excited in a water-cooled hollow cathode at a pressure of 0.2 torr, and the uncertainty of the relative values varying from a few tenthousandths to a few thousandths of a cm-1.
Journal ArticleDOI
Two-time Green's function method in quantum electrodynamics of high-/Z few-electron atoms
TL;DR: The two-time Green's function method in quantum electrodynamics of high-Z few-electron atoms is described in detail in this paper, where a simple procedure for deriving formulas for the energy shift of a single level and for the energies and wave functions of degenerate and quasi-degenerate states is presented.