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Related papers: Atomic Transition Probabilities of Neutral Calcium

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High-resolution bunched-beam collinear laser spectroscopy was used to measure the optical hyperfine spectra of the $^{43-51}$Ca isotopes. The ground state magnetic moments of $^{49,51}$Ca and quadrupole moments of $^{47,49,51}$Ca were…

We describe the current status of the Ca optical frequency standards with laser-cooled neutral atoms realized in two different laboratories for the purpose of developing a possible future optical atomic clock. Frequency measurements…

Atomic Physics · Physics 2009-11-10 U. Sterr , C. Degenhardt , H. Stoehr , Ch. Lisdat , H. Schnatz , J. Helmcke , F. Riehle , G. Wilpers , Ch. Oates , L. Hollberg

The spectrum of the Fe I atom is critical to many areas of astrophysics and beyond. Measurements of the energies of its high-lying levels remain woefully incomplete, however, despite extensive analysis of ultraviolet laboratory iron…

Solar and Stellar Astrophysics · Physics 2015-06-19 Ruth C. Peterson , Robert L. Kurucz

Accurate and extensive atomic data are essential for spectroscopic analyses of stellar atmospheres and other astronomical objects. We present energy levels, lifetimes, and transition probabilities for neutral nitrogen, the sixth most…

Atomic Physics · Physics 2023-03-15 Meichun Li , Wenxian Li , P. Jönsson , Anish M. Amarsi , Jon Grumer

Accurate and comprehensive atomic data are essential for the modelling of stellar spectra. Uncertainties in the oscillator strengths of specific lines used for abundance analyses directly translate into uncertainties in the derived…

Atomic Physics · Physics 2026-02-03 W. Li , A. M. Amarsi , P. Jönsson

We report on saturated absorption spectroscopy measurements of the $(4s^2) ^{1}S_0\rightarrow(4s4p) ^{1}P_1$ transition for the four most abundant even-mass isotopes in calcium. By referencing the laser locked to an ultralow expansion…

Atomic Physics · Physics 2024-06-12 David Röser , Lukas Möller , Hans Keßler , Simon Stellmer

We report new frequency-comb-based measurements of Ca Rydberg energy levels. Counter-propagating laser beams at 390 nm and 423 nm excite Ca atoms from the $4s^2~^1\mbox{S}_0$ ground state to $4sns~^1\mbox{S}_0$ Rydberg levels with $n$…

Atomic Physics · Physics 2023-01-04 Chanhyun Pak , Matthew J. Schlitters , Scott D. Bergeson

Laser cooling and trapping offers the possibility of confining a sample of radioactive atoms in free space. Here, we address the question of how best to take advantage of cold atom properties to perform the observation of as highly…

Atomic Physics · Physics 2009-11-10 S. Sanguinetti , J. Guéna , M. Lintz , Ph. Jacquier , A. Wasan , M-A. Bouchiat

Context. In many plasmas, long-lived metastable atomic levels are depopulated by collisions (quenched) before they decay radiatively. In low-density regions, however, the low collision rate may allow depopulation by electric dipole (E1)…

Astrophysics · Physics 2008-03-07 H. Hartman , J. Gurell , P. Lundin , P. Schef , A. Hibbert , H. Lundberg , S. Mannervik , L. -O. Norlin , P. Royen

Planned optical spectroscopy experiments in lawrencium (Lr, Z = 103) require accurate theoretical predictions of the location of spectral lines in order to narrow the experimental search window. We present ab initio calculations of the…

Atomic and Molecular Clusters · Physics 2021-12-01 E. V. Kahl , S. Raeder , E. Eliav , A. Borschevsky , J. C. Berengut

We report new experimental Fe I oscillator strengths obtained by combining measurements of branching fractions measured with a Fourier Transform spectrometer and time-resolved laser-induced fluorescence lifetimes. The study covers the…

Solar and Stellar Astrophysics · Physics 2017-11-01 M. T. Belmonte , J. C. Pickering , M. P. Ruffoni , E . A. Den Hartog , J. E. Lawler , A. Guzman , U. Heiter

New radiative lifetimes, measured to $\pm$ 5 % accuracy, are reported for 31 even-parity levels of Fe I ranging from 45061 cm$^{-1}$ to 56842 cm$^{-1}$. These lifetimes have been measured using single-step and two-step time-resolved…

Solar and Stellar Astrophysics · Physics 2015-06-23 E. A. Den Hartog , M. P. Ruffoni , J. E. Lawler , J. C. Pickering , K. Lind , N. R. Brewer

We consider transitions of electron holes (vacancies in otherwise filled shells of atomic systems) in multiply-charged ions that, due to level-crossing of the holes, have frequencies within the range of optical atomic clocks. Strong E1…

Atomic Physics · Physics 2011-07-21 J. C. Berengut , V. A. Dzuba , V. V. Flambaum , A. Ong

Relevant uncertainties on theoretical atomic data are vital to determine the accuracy of plasma diagnostics in a number of areas including in particular the astrophysical study. We present a new calculation of the uncertainties on the…

High Energy Astrophysical Phenomena · Physics 2022-01-19 Liyi Gu , Chintan Shah , Ruitian Zhang

A comprehensive theoretical study of the E1, M1, E2 transitions of Ca-like tungsten ions is presented. Using multi-configuration Dirac-Fock (MCDF) method with a restricted active space treatment, the wavelengths and probabilities of the M1…

We perform the non-local thermodynamic equilibrium (NLTE) calculations for Ca I-II with the updated model atom that includes new quantum-mechanical rate coefficients for Ca I + H I collisions from two recent studies, that is, by Barklem and…

Solar and Stellar Astrophysics · Physics 2017-09-13 L. Mashonkina , T. Sitnova , A. K. Belyaev

Theories unifying gravity with other interactions suggest spatial and temporal variation of fundamental ``constants'' in the Universe. A change in the fine structure constant, alpha, could be detected via shifts in the frequencies of atomic…

We present revised measurements of the static electric dipole polarizabilities of K, Rb, and Cs based on atom interferometer experiments presented in [Phys. Rev. A 2015, 92, 052513] but now re-analyzed with new calibrations for the…

Atomic Physics · Physics 2016-06-08 Maxwell D. Gregoire , Nathan Brooks , Raisa Trubko , Alexander D. Cronin

We have been testing the theory used to calculate internal-conversion coefficients (ICCs) by making a series of measurements of alpha_K values with precision better than +/-2%. So far we have measured E3 transitions in three nuclei, 103Rh,…

Nuclear Experiment · Physics 2017-06-01 J. C. Hardy , N. Nica , V. E. Iacob , M. B. Trzhaskovskaya

Theories unifying gravity and other interactions suggest the possibility of spatial and temporal variation of physical ``constants'' in the Universe. Detection of high-redshift absorption systems intersecting the sight lines towards distant…

Atomic Physics · Physics 2009-08-18 V. A. Dzuba , V. V. Flambaum , J. K. Webb.