Theoretical lifetimes for certain O II levels

Marketos, P.; Nandi, T.

doi:10.1007/s004600050361

Cited by 4 publications

(9 citation statements)

References 36 publications

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“…The result (13.4 ± 0.4 ns) is in reasonable agreement with a beam gas (15.1 ± 0.8 ns) [19] measurement and in better agreement with the beam-foil ANDC (12.7 ± 0.9 ns) [20] result. Theoretical predictions are rather lower (CIV3 result (10.95 ns) [6], opacity project result (11.7 ns) † [8] and GRASP (12.0 ns) [7]) (table 1) but still in good agreement with our result.…”

Section: Resultssupporting

confidence: 89%

“…ANDC analysis on the data of the 4119 Å line predicts an average lifetime of 0.85 ± 0.06 ns for 3d 4 D 3/2,5/2,7/2 . A recent calculation [7] predicts the 3d 4 D 7/2 level lifetime to be much larger than the lifetimes of the rest of the levels of this term. To test this prediction, we have subtracted the contribution of 3d 4 D 3/2,5/2 , using our average 3d 4 D lifetime measured through the 4105 Å decay, from the intensity decay of the 4119 Å line and then fitted the resulting curve with 2-e.…”

Section: Resultsmentioning

confidence: 92%

“…Lifetimes for 4s 2 D, 4s 4 P and 2s2p 3 ( 5 S)4s 6 S o 5/2 have also been measured for the first time. Results from our experimental investigation are also compared with theoretical predictions [6][7][8]. Such comparisons are welcome and are expected to clarify the extent to which departures from LS coupling and LS mixing influence level lifetimes in a system as light as O II.…”

Section: Introductionmentioning

confidence: 82%

“…These uncertainties are reflected in the scattering of the corresponding experimental lifetime values, as exhibited e.g. in table 1 of [7].…”

Section: Introductionmentioning

confidence: 99%

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Lifetimes of some O II levels by beam-foil experiments

Nandi

Marketos

Bhattacharya

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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Using the beam-foil technique and rather low beam energies (in the range 216-296 keV) in order to reduce cascade corrections, we have determined lifetimes for the , and terms of O II and compared them with predictions from various theoretical and experimental approaches. Our results support the claim for a short average lifetime. Experimental lifetimes for , and have been determined for the first time. The first two compare well with the opacity project results, whereas the experimental lifetime of level, a pseudo-five-electron system lying above the O II ionization limit, is a factor of four smaller.

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Section: Resultssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 82%

“…These uncertainties are reflected in the scattering of the corresponding experimental lifetime values, as exhibited e.g. in table 1 of [7].…”

Section: Introductionmentioning

confidence: 99%

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Lifetimes of some O II levels by beam-foil experiments

Nandi

Marketos

Bhattacharya

et al. 1999

J. Phys. B: At. Mol. Opt. Phys.

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“…Lifetimes of all 707 excited fine structure levels of O II are available electronically, and a sample of lifetimes is given in [17](b), [9](c), [10](d), [18](e), [4](f). NTr represents the number of radiative decays of the level.…”

Section: Lifetimesmentioning

confidence: 99%

Oscillator strengths and transition probabilities of O II

Nahar

2010

Atomic Data and Nuclear Data Tables

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The abundance of singly ionized oxygen, O II, in planetary nebulae provides crucial diagnostic tests for the physical conditions present in these astrophysical environments. The abundance can be determined from the absorption lines formed by the radiative processes, such as the photo-excitations reported here. Radiative transitions are obtained from a total of 708 fine structure levels of O II with n ≤ 10, l ≤ 9, and 1/2 ≤ J ≤ 17/2. For spectral analysis oscillator strengths, line strengths, and transition probabilities (A) are presented for 51,733 electric dipole fine structure radiative transitions. The calculations were carried out in the relativistic Breit-Pauli R-matrix approximation. The transitions have been identified spectroscopically using quantum defect analysis and other criteria. The calculated energies agree with the observed energies within 5% for most of the levels. However, some relatively large differences are noted, the largest difference being 13% for the level 2s

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Commission 14: Atomic and Molecular Data: (Donnees Atomiques et Moleculaires)

Rostas¹,

Smith²,

Berrington³

et al. 2000

Trans. Int. Astron. Union

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In recognition of its special interdisciplinary character, IAU Commission 14 is linked directly to the Executive Committee. The Commission’s role is to inform the astronomical community of new developments in the diverse fields of research which involve atoms and molecules. Conversely it endeavors to sensitize the research community active in those fields to the specific needs of astronomy, especially concerning basic data and modeling tools. More generally, Commission 14 tries to foster long term relations and collaborations between the two communities and, when necessary, to alert funding authorities to the specific needs of ground and space based astronomy for specific atomic and molecular data. This report is one of the main contributions of Commission 14 to the information of the astronomical community. Several meetings concerned, at least in part, with the need and availability of atomic and molecular data for astrophysics were also sponsored or co-sponsored. In the last triennium, Commission 14 cosponsored IAU Symposium 194 “Astrochemistry: From Molecular Cloud to Planetary Systems” held in Sogwipo (Korea) from Aug. 23 to 27, 1999 and organized by Commission 34. A Joint Discussion: JD1 on “Atomic and Molecular Data for Astrophysics, New Developments, Case Studies and Future Needs” has been planned for the XXIVth IAU General Assembly in Manchester (Aug. 7-19, 2000) and cosponsored by Commissions 15, 16, 29, 34, 36, 40 and 44. Several other Joint Discussions to be held at the Manchester General Assembly are co-sponsored by this commission.

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Theoretical lifetimes for certain O II levels

Cited by 4 publications

References 36 publications

Lifetimes of some O II levels by beam-foil experiments

Lifetimes of some O II levels by beam-foil experiments

Oscillator strengths and transition probabilities of O II

Commission 14: Atomic and Molecular Data: (Donnees Atomiques et Moleculaires)

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