Lifetime measurements of the3 P 2 and4 P 5 2/0 states in He- and Li-like titanium and chromium

Dohmann, H.; Mann, Robert B.; Pfeng, E.

doi:10.1007/bf01414970

Cited by 15 publications

(6 citation statements)

References 18 publications

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“…Using the present setup, the measured lifetimes show very good agreement with earlier measurements, [16][17][18] while interaction mechanism studies hint on population transfers from one state to another within a shell during a collision. Using the present setup, the measured lifetimes show very good agreement with earlier measurements, [16][17][18] while interaction mechanism studies hint on population transfers from one state to another within a shell during a collision.…”

Section: Discussionsupporting

confidence: 86%

Beam-single and beam-two-foil experimental facility to study physics of highly charged ions

Ahmad

Wani

Ram

et al. 2006

Review of Scientific Instruments

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Formation of doubly positively charged diatomic ions of Mo 2 2+ produced by Ar + sputtering of an Mo metal surface Resonance ionization spectroscopy investigations of electronic processes during ion-beam sputtering of metal atoms AIP Conf.A facility for lifetime measurement of metastable states in highly charged ions using the beam-foil technique with a single-foil and a two-foil target has been developed. In the two-foil technique, one foil moves with respect to the other and the option of varying the thickness of the fixed foil online has been implemented. A holder with multiple foils is used as a fixed target, and moved along x, y, and , the angle of rotation with respect to beam direction along the z axis. Using this facility, the He-like 1s2p 3 P 2 o and Li-like 1s2s2p 4 P 5/2 o titanium lifetimes have been measured and compared with earlier values. In addition to this, the processes which occur when excited states collide with carbon foils of different thicknesses have also been investigated. Preliminary results suggest the scope of studying intrashell transitions during ion-solid collision using this setup. In this article, the setup is described in detail and representative results are briefly discussed.

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Section: Discussionsupporting

confidence: 86%

Beam-single and beam-two-foil experimental facility to study physics of highly charged ions

Ahmad

Wani

Ram

et al. 2006

Review of Scientific Instruments

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“…11. To our knowledge, the available measurements of lifetimes for helium-like ions are mostly confined to 1s2l levels (Cocke et al 1973(Cocke et al , 1974aGould et al 1974;Bednar et al 1975;Varghese et al 1976;Dohmann & Mann 1979;Denne et al 1980;Armour et al 1981;Deschepper et al 1982;Dohmann et al 1982;Buchet et al 1984;Hubricht & Träbert 1987;Stefanelli et al 1995;Träbert et al 1999;Nandi et al 2004;Crespo López-Urrutia et al 2006). Figure 12 shows the comparison of our calculated lifetimes and experimental values as functions of Z for 1s2p 3 P 1 , 1s2p 3 P 2 and 1s2s 3 S 1 states.…”

Section: Radiative Lifetimesmentioning

confidence: 86%

“…Experimental data for 1s2s 3 S 1 are taken from Träbert et al (1999), Stefanelli et al (1995), Crespo López-Urrutia et al (2006), Bednar et al (1975), Hubricht & Träbert (1987), Cocke et al (1973), and Gould et al (1974). Values for 1s2p 3 P 2 are adopted from Denne et al (1980), Deschepper et al (1982), Cocke et al (1974b), Cocke et al (1974a), Dohmann & Mann (1979), Dohmann et al (1982), Buchet et al (1984), and Nandi et al (2004). For 1s2p 3 P 1 the values are taken from Armour et al (1981) and Varghese et al (1976).…”

Section: Discussionmentioning

confidence: 99%

Energy levels and transition rates for helium-like ions withZ = 10–36

Guo

Wang

et al. 2016

A&A

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Aims. Helium-like ions provide an important X-ray spectral diagnostics in astrophysical and high-temperature fusion plasmas. An interpretation of the observed spectra provides information on temperature, density, and chemical compositions of the plasma. Such an analysis requires information for a wide range of atomic parameters, including energy levels and transition rates. Our aim is to provide a set of accurate energy levels and transition rates for helium-like ions with Z = 10-36. Methods. The second-order many-body perturbation theory (MBPT) was adopted in this paper. To support our MBPT results, we performed an independent calculation using the multiconfiguration Dirac-Hartree-Fock (MCDHF) method. Results. We provide accurate energies for the lowest singly excited 70 levels among 1snl (n ≤ 6, l ≤ (n − 1)) configurations and the lowest doubly excited 250 levels arising from the K-vacancy 2ln l (n ≤ 6, l ≤ (n − 1)) configurations of helium-like ions with Z = 10−36. Wavelengths, transition rates, oscillator strengths, and line strengths are calculated for the E1, M1, E2, and M2 transitions among these levels. The radiative lifetimes are reported for all the calculated levels. Conclusions. Our MBPT results for singly excited n ≤ 2 levels show excellent agreement with other elaborate calculations, while those for singly excited n ≥ 3 and doubly excited levels show significant improvements over previous theoretical results. Our results will be very helpful for astrophysical line identification and plasma diagnostics.

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“…This analysis using correlated decay curves for the primary and cascade levels can be particularly important when the primary and cascade levels have similar lifetimes. If applied correctly, and if all the important cascades are included, this technique normally yields results with smaller systematic errors than are possible using standard multi-exponential curve-fitting of the primary decay curve alone (for some general aspects of the problem and other solutions, see also Hopkins and von Brentano (1976) and Dohmann et al (1982)). Of the present data, the decays of the Ca X 3p and 3d levels Theodosiou and Curtis (1988); this curve is practically indistinguishable from the results of ab initio Dirac-Fock calculations for Z > 55 by Baik et al (1991) and of many-body perturbation theory calculations by Guet et al (1990) for Z < 30.…”

Section: Data Acquisition and Evaluationmentioning

confidence: 99%

Beam - foil study of the lifetimes of levels in Na-like Ca X, Mg-like Ca IX and Si-like Ca VII

Träbert

Pinnington

Kernahan

et al. 1996

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

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Levels of Ca ions with one, two or four electrons in the n = 3 shell have been studied for their decay properties and lifetimes. For the 3p 2 P o 1/2,3/2 levels of Ca X and the 3s3p 1 P o 1 level of Ca IX, arbitrarily normalized decay curve (ANDC) and cascade model analyses yield results with precisions of 10% and less and with low systematic uncertainties. The measured lifetime of the Ca IX 3s3d 1 D 2 level confirms the need to include relativistic effects in the calculation. The lifetime results are compared to other, experimental and theoretical, data available for the isoelectronic sequences.

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Lifetime measurements of the3 P 2 and4 P 5 2/0 states in He- and Li-like titanium and chromium

Cited by 15 publications

References 18 publications

Beam-single and beam-two-foil experimental facility to study physics of highly charged ions

Beam-single and beam-two-foil experimental facility to study physics of highly charged ions

Energy levels and transition rates for helium-like ions withZ = 10–36

Beam - foil study of the lifetimes of levels in Na-like Ca X, Mg-like Ca IX and Si-like Ca VII

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