New classifications of highly ionized Ni, Co, Cr, V and isoelectronic spectra (Solar spectra)

Fawcett, B C; Hayes, R. W.; Cowan, Robert D.

doi:10.1088/0022-3700/5/11/021

Cited by 44 publications

(29 citation statements)

References 22 publications

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“…is 4 408 500 ± 300 cm −1 , as compiled by Kelly (1987) and formerly derived by Edlén (1978) from core polarization theory applied to the nf series of the sodium-like ions. Different degrees of uncertainty were estimated for the energy levels of Co 16+ , the largest corresponding to the 5s 2 S 1/2 level, 2 967 700 ± 3000 cm −1 as earlier reported by Fawcett et al (1972).…”

Section: Numerical Resultsmentioning

confidence: 70%

Relativistic quantum defect orbital study of forbidden transitions in Co¹⁶⁺

Charro

Martı́n

2001

A&A

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Abstract. Theoretical line strengths and transition probabilities for electric quadrupole (E2) transitions between levels belonging to several important configurations of Co 16+ are reported. The calculations have been carried out with the Relativistic Quantum Defect Orbital (RQDO) method. A general good accord between the present results and some earlier theoretical data is found. Some of the E2 transition probabilities are reported for the first time. The correct systematic behaviour of the RQDO line strengths along the spectral series is reproduced by the present results in the absence of configuration mixing. This semiempirical method appears to adequately describe E2 transitions in this medium-Z atomic system.

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Section: Numerical Resultsmentioning

confidence: 70%

Relativistic quantum defect orbital study of forbidden transitions in Co¹⁶⁺

Charro

Martı́n

2001

A&A

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“…Its lines have also been measured in laboratory plasmas by Fawcett et al (1972), and identified in the soft X-ray region (5-175 Å) in the F-type stars Procyon and α Centauri by Raassen et al (2002Raassen et al ( , 2003 from spectra obtained by the Chandra and XMM-Newton satellites. Similarly, spectra in the 14.4-16.5 nm wavelength range in high temperature JET tokamak plasmas have revealed many emission lines from Ni ions, including Ni xi (Mattioli et al 2004).…”

Section: Introductionmentioning

confidence: 91%

“…Furthermore, transitions involving the higher excited levels of the n = 4 configurations have already been observed in solar plasmas (Wagner & House 1971) as well as laboratory sources (Fawcett et al 1972), and therefore there is a clear need to include the n = 4 configurations in generating the atomic data. Subsequently, we have included the additional four configurations (3s 2 3p 5 4 ), which give rise to only 38 levels, but closely interact with the levels of the above listed seven n = 3 configurations.…”

Section: Energy Levelsmentioning

confidence: 99%

Energy levels, radiative rates and excitation rates for transitions in Ni XI

Aggarwal¹,

Keenan²

2007

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Aims. In this paper we report calculations for energy levels, radiative rates and excitation rates for transitions in Ni xi. Methods. The grasp (General-purpose Relativistic Atomic Structure Package) and fac (Flexible Atomic Code) have been adopted for calculating energy levels and radiative rates, and the Dirac Atomic R-matrix Code (darc) has been used to determine the excitation rates.Results. Oscillator strengths, radiative rates and line strengths are reported for all E1, E2, M1 and M2 transitions among the lowest 250 levels of Ni xi. Additionally, lifetimes are also reported for all levels. However, results for excitation rates are presented only for transitions among the lowest 17 levels.

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“…Nineteen lines of 3p4 -3p 3 4s transitions in the range of 135 -148 A, including the spin-forbidden transitions 102-3 P 2 and 3P2-102 at 140.934 A and 139.188 A, were identified by Edlen (1937)25 using vacuum spark observations. Fawcett et al (1972) Vx (Si sequence) Fawcett and Peacock (1967) 33 andFawcett (1970)35, (1971)37 analyzed of the 3s 2 3p2-3s3p 3 transition array in the range of 308 -471 A. Improved wavelengths with an uncertainty of ± 0.008 A were obtained by Smitt et al (1976)78 with a vacuum spark discharge.…”

Section: VII (Ci Sequence)mentioning

confidence: 99%