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

Vujnović, Vladis; Blagoev, K.; Fürböck, Christof; Neger, Theo; Jäger, Helmut

doi:10.1051/0004-6361:20020560

Cited by 13 publications

(10 citation statements)

References 46 publications

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“…The only exceptions are the transitions with 3s 2 4d 2 D 3/2,5/2 a as upper levels, for which the A RCI values agree better with the ones suggested by Davidson et al (1990). Although the evaluated transition rates by Vujnović et al (2002) slightly differ from the other observations, they are still in fairly good agreement with the present work. For the 3s 2 4p 2 P o 3/2 → 3s 2 4s 2 S 1/2 and 3s 2 3d 2 D 5/2 → 3s 2 3p 2 P o…”

Section: Ls J E Obssupporting

confidence: 91%

“…Using similar laser techniques, Davidson et al (1990) measured the natural lifetimes of the 3s 2 nd 2 D Rydberg series and obtained oscillator strengths for transitions to the ground state. In a more recent work, Vujnović et al (2002) used the hollow cathode discharge method to measure relative intensities of spectral lines of both neutral and singly ionized aluminium. Absolute transition probabilities were evaluated based on available results from previous studies, such as the ones mentioned above.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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Section: Ls J E Obssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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

Papoulia

Ekman

Jönsson

2018

A&A

View full text Add to dashboard Cite

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“…Those data usually have rather poor accuracy grades, thus further data improvement can rectify this situation. For three lines of Al I, we adopt experimental data of Vujnović et al (2002) and Davidson et al (1990) and assign an accuracy grade of B.…”

Section: Aluminum Speciesmentioning

confidence: 99%

Atomic Data Revisions for Transitions Relevant to Observations of Interstellar, Circumgalactic, and Intergalactic Matter

Cashman

Kulkarni

Kisielius

et al. 2017

ApJS

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Measurements of element abundances in galaxies from astrophysical spectroscopy depend sensitively on the atomic data used. With the goal of making the latest atomic data accessible to the community, we present a compilation of selected atomic data for resonant absorption lines at wavelengths longward of 911.753Å (the H I Lyman limit), for key heavy elements (heavier than atomic number 5) of astrophysical interest. In particular, we focus on the transitions of those ions that have been observed in the Milky Way interstellar medium (ISM), the circumgalactic medium (CGM) of the Milky Way and/or other galaxies, and the intergalactic medium (IGM). We provide wavelengths, oscillator strengths, associated accuracy grades, and references to the oscillator strength determinations. We also attempt to compare and assess the recent oscillator strength determinations. For about 22% of the lines that have updated oscillator strength values, the differences between the former values and the updated ones are 0.1 dex. Our compilation will be a useful resource for absorption line studies of the ISM, as well as studies of the CGM and IGM traced by sight lines to quasars and gamma-ray bursts. Studies (including those enabled by future generations of extremely large telescopes) of absorption by galaxies against the light of background galaxies will also benefit from our compilation.

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“…From these experiments the presence of metastable aluminum atoms in the 4 Pð3s3p 2 Þ state at ∼29 000 cm −1 above the ground state [19][20][21] has been established through observation of a series of 13 separate electronic transitions originating from this electronic state. In complete contrast to almost all previous studies, the wavelengths at which spectral transitions are recorded for these metal atoms in helium droplets exhibit almost no shift from those measured in the gas phase [19].…”

mentioning

confidence: 99%

“…S5 of the Supplemental Material for a complete scan [25]). A search of known electronic transitions in aluminum atoms that, with a single photon, would place atoms above the lowest ionization limit (48 278.37 cm −1 ) at the energies covered [19][20][21] suggests that all of the transitions shown in Fig. 2(b) originate from spin-orbit substates derived from the Al 4 Pð3s3p 2 Þ state, which lies approximately 29 000 cm −1 above the ground state.…”

mentioning

confidence: 99%

Metastable Aluminum Atoms Floating on the Surface of Helium Nanodroplets

et al. 2015

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Metal atoms have proved to be sensitive probes of the properties of superfluid helium nanodroplets. To date, all experiments on the doping of helium droplets have concentrated on the attachment of metal atoms in their ground electronic states. Here we report the first examples of metal atoms in excited states becoming attached to helium nanodroplets. The atoms in question are aluminum, and they have been generated by laser ablation in a metastable quartet state, which attaches to and remains on the surface of helium droplets. Evidence for a surface location comes from electronic spectra, which consist of very narrow absorption profiles that show very small spectral shifts. Supporting ab initio calculations show there to be an energy incentive for a metastable Al atom to remain on the surface of a helium droplet rather than move to the interior. The results suggest that helium droplets may provide a method for the capture and transport of metastable excited atomic and molecular species.

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

Cited by 13 publications

References 46 publications

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

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

Atomic Data Revisions for Transitions Relevant to Observations of Interstellar, Circumgalactic, and Intergalactic Matter

Metastable Aluminum Atoms Floating on the Surface of Helium Nanodroplets

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