Investigation of the 4s4p2 configuration in gallium

Buurman, E. P.; Koning, O.J.; Snoek, Cees G. M.; Dönszelmann, A.

doi:10.1016/0378-4363(87)90089-1

Cited by 6 publications

(16 citation statements)

References 7 publications

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“…Aluminium: For our seven lines the first three have log g fvalues from Prochaska et al (2000) (based on Buurman 1986). These give an average abundance 0.13 dex below the standard solar value.…”

Section: Discussionmentioning

confidence: 99%

Elemental abundance trends in the Galactic thin and thick disks as traced by nearby F and G dwarf stars

Bensby

Feltzing

Lundström

2003

A&A

843

119

1,269

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Abstract. Based on spectra from F and G dwarf stars, we present elemental abundance trends in the Galactic thin and thick disks in the metallicity regime −0.8 [Fe/H] +0.4. Our findings can be summarized as follows. 1) Both the thin and the thick disks show smooth and distinct abundance trends that, at sub-solar metallicities, are clearly separated. 2) For the α-elements the thick disk shows signatures of chemical enrichment from SNe type Ia.3) The age of the thick disk sample is in the mean older than the thin disk sample. 4) Kinematically, there exist thick disk stars with super-solar metallicities. Based on these findings, together with other constraints from the literature, we discuss different formation scenarios for the thick disk. We suggest that the currently most likely formation scenario is a violent merger event or a close encounter with a companion galaxy. Based on kinematics the stellar sample was selected to contain stars with high probabilities of belonging either to the thin or to the thick Galactic disk. The total number of stars are 66 of which 21 belong to the thick disk and 45 to the thin disk. The analysis is based on high-resolution spectra with high signal-to-noise (R ∼ 48 000 and S /N 150, respectively) recorded with the FEROS spectrograph on La Silla, Chile. Abundances have been determined for four α-elements (Mg, Si, Ca, and Ti), for four even-nuclei iron peak elements (Cr, Fe, Ni, and Zn), and for the light elements Na and Al, from equivalent width measurements of ∼30 000 spectral lines. An extensive investigation of the atomic parameters, log g f -values in particular, have been performed in order to achieve abundances that are trustworthy. Noteworthy is that we find for Ti good agreement between the abundances from Ti  and Ti . Our solar Ti abundances are in concordance with the standard meteoritic Ti abundance.

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Section: Discussionmentioning

confidence: 99%

Elemental abundance trends in the Galactic thin and thick disks as traced by nearby F and G dwarf stars

Bensby

Feltzing

Lundström

2003

A&A

843

119

1,269

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“…Buurman et al (1986) measured their branching ratios, without resolving the fine structure, with an error of 10%. For 5s−4p transitions we evaluated the transition probabilities assuming theoretical intensity ratios of the component lines.…”

Section: Discussionmentioning

confidence: 99%

“…We obtained the lifetime of the Al I 4s level as an average of the values obtained by Klose (1997) and Buurman et al (1986). In the same laboratory Buurmann & Dönszelmann (1990) found deviations from the LS expected equality of the lifetimes of the fine structure levels 2 P 1/2 , 2 P 3/2 .…”

Section: Lifetimesmentioning

confidence: 99%

“…In the same laboratory Buurmann & Dönszelmann (1990) found deviations from the LS expected equality of the lifetimes of the fine structure levels 2 P 1/2 , 2 P 3/2 . The lifetime of 3d equal to 14.0(2) ns was taken over from Buurman et al (1986). It should be mention that the average of seven measurements (Jönsson & Lundberg 1983;Buurman et al 1986;Andersen et al 1969;Cunningham 1968;Smith & Liszt 1971;Marek & Richter 1973;Hannaford & Lowe 1981) is equal to 13.9 ns.…”

Section: Lifetimesmentioning

confidence: 99%

“…In the case of neutral aluminum, the lifetimes were measured by the Hanle effect, hook, beam foil, phase shift and LIF techniques, and calculated by several authors. Many measurements were undertaken of 4s and 3d lifetimes, and s, p, d level series were experimentally covered in a wide range: ns for n = 4−10 (Jönsson & Lundberg 1983;Buurman et al 1986), np for n = 4−12 (Buurman et al 1986;Jönsson et al 1984), nd for n = 3−13 (Jönsson & Lundberg 1983;Buurman et al 1986;Davidson et al 1990). For the nf levels only theoretical values exist (Theodosiou 1992).…”

Section: Lifetimesmentioning

confidence: 99%

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Absolute transition probabilities of Al I and Al II spectral lines and intensity ratios within multiplets

Vujnović

Blagoev

Fürböck

et al. 2002

A&A

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Extended transition rates and lifetimes in Al I and Al II from systematic multiconfiguration calculations

Papoulia

Ekman

Jönsson

2018

A&A

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Aims. The objective of this work is to provide a substantial amount of updated atomic data for the systems of neutral and singly ionized aluminium, including transition data in the infrared region. This is particularly important since the new generation of telescopes are designed for this region. Methods. Multiconfiguration Dirac-Hartree-Fock (MCDHF) and relativistic configuration interaction (RCI) calculations were performed for 28 and 78 states in neutral and singly ionized aluminium, respectively. In Al I, the configurations of interest are 3s 2 nl for n = 3, 4, 5 with l = 0 to 4, as well as 3s3p 2 and 3s 2 6l for l = 0, 1, 2. In Al II, the studied configurations are, besides the ground configuration 3s 2 , 3snl with n = 3 to 6 and l = 0 to 5, 3p 2 , 3s7s, 3s7p and 3p3d. Valence and core-valence electron correlation effects are systematically accounted for through large configuration state function (CSF) expansions. Results. Calculated excitation energies are found to be in excellent agreement with experimental data from the NIST database. Lifetimes and transition data for radiative electric dipole (E1) transitions are given and compared with results from previous calculations and available measurements, for both Al I and Al II. The computed lifetimes of Al I are in very good agreement with the measured lifetimes in high-precision laser spectroscopy experiments. There is a significant improvement in accuracy, in particular for the more complex system of neutral Al I.

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Investigation of the 4s4p2 configuration in gallium

Cited by 6 publications

References 7 publications

Elemental abundance trends in the Galactic thin and thick disks as traced by nearby F and G dwarf stars

Elemental abundance trends in the Galactic thin and thick disks as traced by nearby F and G dwarf stars

Absolute transition probabilities of Al I and Al II spectral lines and intensity ratios within multiplets

Extended transition rates and lifetimes in Al I and Al II from systematic multiconfiguration calculations

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