Results 1 to 10 of about 161,159 (117)

Quantum time dilation in atomic spectra

Physical Review Research, 2021
Quantum time dilation occurs when a clock moves in a superposition of relativistic momentum wave packets. The lifetime of an excited hydrogenlike atom can be used as a clock, which we use to demonstrate how quantum time dilation manifests in a ...
Piotr T Grochowski, Alexander R H Smith, Andrzej Dragan   +2 more
exaly   +2 more sources

The Belgian Repository of Fundamental Atomic Data and Stellar Spectra (BRASS) Identifying Fruitful Methods for Producing Atomic Data

Galaxies, 2018
The Belgian repository of fundamental atomic data and stellar spectra (BRASS) aims to provide the largest systematic and homogeneous quality assessment to-date of input atomic data required for stellar spectral synthesis.
M Laverick, A Lobel, Pierre Royer
exaly   +3 more sources

Atomic Lifetime Data and Databases

Atoms, 2022
Atomic-level lifetimes span a wide range, from attoseconds to years, relating to transition energy, multipole order, atomic core charge, relativistic effects, perturbation of atomic symmetries by external fields, and so on.
Elmar Träbert
doaj   +1 more source

A network approach to atomic spectra

Journal of Physics: Complexity, 2023
Network science provides a universal framework for modeling complex systems, contrasting the reductionist approach generally adopted in physics. In a prototypical study, we utilize network models created from spectroscopic data of atoms to predict ...
David Wellnitz, Armin Kekić, Julian Heiss, Michael Gertz, Matthias Weidemüller, Andreas Spitz   +5 more
doaj   +1 more source

High-Resolution Laboratory Measurements and Identification of Fe IX Lines near 171 Å

Atoms, 2022
A multitude of weaker Fe IX lines have been predicted in the vicinity of the strong 171 Å line that dominates the spectra of many astrophysical and laboratory sources.
Peter Beiersdorfer, Jaan K. Lepson, Gregory V. Brown, Natalie Hell, Elmar Träbert, Michael Hahn, Daniel W. Savin   +6 more
doaj   +1 more source

New Transition and Energy Levels of Three-Times Ionized Krypton (Kr IV)

Atoms, 2021
A capillary pulsed-discharge and a theta-pinch were used to record Kr spectra in the region of 330–4800 Å. A set of 168 transitions of these spectra were classified for the first time.
M. Raineri, M. Gallardo, J. Reyna Almandos, A. G. Trigueiros, C. J. B. Pagan   +4 more
doaj   +1 more source

Laboratory Search for Fe IX Solar Diagnostic Lines Using an Electron Beam Ion Trap

Atoms, 2022
The Fe IX spectrum features two lines in the extreme ultraviolet whose ratio has been rated among the best density diagnostics in the solar spectrum.
Elmar Träbert, Peter Beiersdorfer, Gregory V. Brown, Natalie Hell, Jaan K. Lepson, Alexander J. Fairchild, Michael Hahn, Daniel W. Savin   +7 more
doaj   +1 more source

On Atomic Lifetimes and Environmental Density

Atoms, 2022
Atomic lifetime measurements span a wide range, from attoseconds to years. The frontier of exploratory lifetime measurements, presently, is in the long part of the above time range, with an eye on astrophysical problems. In a combination of review paper,
Elmar Träbert
doaj   +1 more source

Transition Rates for 3s3p^{2 4}P–3s3p4s ⁴P^o Transitions in Al i

Atoms, 2019
Fully relativistic calculations have been performed for two multiplets, 3 s 3 p 2 4 P and 3 s 3 p 4 s 4 P o , in Al i. Wave functions were obtained for all levels of these multiplets using the grasp programs.
Charlotte Froese Fischer, James F. Babb
doaj   +1 more source

Laboratory Hydrogen-Beta Emission Spectroscopy for Analysis of Astrophysical White Dwarf Spectra

Atoms, 2018
This work communicates a review on Balmer series hydrogen beta line measurements and applications for analysis of white dwarf stars. Laser-induced plasma investigations explore electron density and temperature ranges comparable to white dwarf star ...
Christian G. Parigger, Kyle A. Drake, Christopher M. Helstern, Ghaneshwar Gautam   +3 more
doaj   +1 more source