Isotope shifts and hyperfine structure in the $\mathsf{ 3d ^2D_J \rightarrow 4p ^2P_J}$ transitions in calcium II

Nörtershäuser, W.; Blaum, Klaus; Icker, K.; Müller, Patrick; Schmitt, A.; Wendt, Κ.; Wiche, B.

doi:10.1007/s100530050107

Cited by 56 publications

(50 citation statements)

References 2 publications

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“…The spectra of HD 221507 and of HD 84461 have been retrieved from the ESO archive. Nörtershäuser et al (1998) (Table 2). Therefore, the measurement of the exact wavelengths of the Ca  infrared lines may give information on the isotopic composition of slowly rotating stars observed at high-resolution and high S/N ratio.…”

Section: Observationsmentioning

confidence: 99%

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The Ca II infrared triplet as indicator of anomalous Ca isotopic mixture in HgMn stars

Castelli

Hubrig

2004

A&A

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Abstract.For the first time we present observational evidence for an anomalous isotopic structure of Ca  in mercury-manganese (HgMn) stars. The centroid wavelengths of Ca  infrared triplet lines in a number of stars have been found redshifted with respect to the centroids of the terrestrial Ca  lines. The record holder is the star HD 175640 for which the measured wavelength is consistent with Ca  being present in the atmosphere entirely in form of the heaviest stable isotope 48 Ca. This is a very striking result as 48 Ca makes up only 0.187% of the terrestrial Ca mixture.

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Section: Observationsmentioning

confidence: 99%

“…Therefore, the measurement of the exact wavelengths of the Ca  infrared lines may give information on the isotopic composition of slowly rotating stars observed at high-resolution and high S/N ratio. Nörtershäuser et al (1998) . Table 3 lists the atomic data that we adopted for computing the Ca  infrared profiles.…”

Section: Observationsmentioning

confidence: 99%

The Ca II infrared triplet as indicator of anomalous Ca isotopic mixture in HgMn stars

Castelli

Hubrig

2004

A&A

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“…Therefore, scaling procedure described in Section III A is not expected to produce more accurate values and is not carried out for the hyperfine constants. In Table XI, we list hyperfine constants A for 43 Ca + and compare our values with available theoretical [55] and experimental data [48,53].…”

Section: Optical Frequency Standardmentioning

confidence: 99%

“…[52] to determine the magnetic dipole hyperfine interaction constant A for the 4p 1/2 and 3d 3/2 states of 43 Ca + . Hyperfine structure in the three 3d 3/2,5/2 ⇒ 4p 1/2,3/2 transitions were studied by fast ion beam collinear laser spectroscopy for all stable Ca isotopes in [53]. Hyperfine structure parameters A(4p), A(3d), B(4p 3/2 ), and B(3d j ) for the odd isotope 43 Ca + , as evaluated from the splittings observed, agreed well with theoretical predictions from relativistic manybody perturbation theory [47,49].…”

Section: Camentioning

confidence: 99%

Blackbody radiation shift, multipole polarizabilities, oscillator strengths, lifetimes, hyperfine constants, and excitation energies in Ca+

Safronova

2011

Phys. Rev. A

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A systematic study of Ca + atomic properties is carried out using high-precision relativistic allorder method where all single, double, and partial triple excitations of the Dirac-Fock wave functions are included to all orders of perturbation theory. Reduced matrix elements, oscillator strengths, transition rates, and lifetimes are determined for the levels up to n = 7. Recommended values and estimates of their uncertainties are provided for a large number of electric-dipole transitions. Electric-dipole scalar polarizabilities for the 5s, 6s, 7s, 8s, 4pj , 5pj, 3dj , and 4dj states and tensor polarizabilities for the 4p 3/2 , 5p 3/2 , 3dj , and 4dj states in Ca + are calculated. Methods are developed to accurately treat the contributions from highly-excited states, resulting in significant (factor of 3) improvement in accuracy of the 3d 5/2 static polarizability value, 31.8(3) a + is calculated to be 0.381(4) Hz at room temperature, T = 300 K. Electric-quadrupole 4s−nd and electric-octupole 4s−nf matrix elements are calculated to obtain the ground state multipole E2 and E3 static polarizabilities. Excitation energies of the ns, np, nd, nf , and ng states with n ≤ 7 in are evaluated and compared with experiment. Recommended values are provided for the 7p 1/2 , 7p 3/2 , 8p 1/2 , and 8p 3/2 removal energies for which experimental measurements are not available. The hyperfine constants A are determined for the low-lying levels up to n = 7. The quadratic Stark effect on hyperfine structure levels of 43 Ca + ground state is investigated. These calculations provide recommended values critically evaluated for their accuracy for a number of Ca + atomic properties for use in planning and analysis of various experiments as well as theoretical modeling.

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“…While large shifts may be confined to a few exotic objects, workers should be aware that they can occur. The relevant laboratory measurements were described by Nörtershäuser et al (1998). The relatively large wavelength displacements are caused by mass-dependent, collective motions of the electrons and the atomic nucleus.…”

Section: Introductionmentioning

confidence: 99%

The calcium isotopic anomaly in magnetic CP stars

Cowley

Hubrig

2005

A&A

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Abstract. Chemically peculiar stars in the magnetic sequence can show the same isotopic anomaly in calcium previously discovered for mercury-manganese stars in the non-magnetic sequence. In extreme cases, the dominant isotope is the exotic 48 Ca.Measurements of Ca  lines arising from 3d−4p transitions reveal the anomaly by showing shifts up to 0.2 Å for the extreme cases -too large to be measurement errors. We report measurements of miscellaneous objects, including two metal-poor stars, two apparently normal F-stars, an Am-star, and the N-star U Ant. Demonstrable anomalies are apparent only for the Ap stars.The largest shifts are found in rapidly oscillating Ap stars and in one weakly magnetic Ap star, HD 133792. We note the possible relevance of these shifts for the GAIA mission.

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Isotope shifts and hyperfine structure in the $\mathsf{ 3d ^2D_J \rightarrow 4p ^2P_J}$ transitions in calcium II

Cited by 56 publications

References 2 publications

The Ca II infrared triplet as indicator of anomalous Ca isotopic mixture in HgMn stars

The Ca II infrared triplet as indicator of anomalous Ca isotopic mixture in HgMn stars

Blackbody radiation shift, multipole polarizabilities, oscillator strengths, lifetimes, hyperfine constants, and excitation energies in Ca+

The calcium isotopic anomaly in magnetic CP stars

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