Line identifications and lifetime measurements in singly and doubly excited C IV and in C V

Jacques, Christian; Knystautas, Émile J.; Drouin, R.; Berry, H. G.

doi:10.1139/p80-149

Cited by 20 publications

(5 citation statements)

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“…Thus it is noteworthy that six of the tentative identifications made by Berry et al have been shown to be valid. More measurements were performed by To et al [54] and Jacques et al [143]. Here wavelengths up to 2500A were included.…”

Section: B2+mentioning

confidence: 99%

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Optical studies of multiply excited states

Mannervik¹

1989

Phys. Scr.

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Optical studies of multiply-excited states are reviewed with emphasis on emission spectroscopy. From optical measurements, properties such as excitation energies, lifetimes and autoionization widths can be determined with high accuracy, which constitutes a challenge for modern computational methods. This article mainly covers work on two-, three- and four-electron systems, but also sodium-like quartet systems. Furthermore, some comments are given on bound multiply-excited states in negative ions. Fine structure effects on transition wavelengths and lifetimes (autoionization) are discussed. In particular, the most recent experimental and theoretical studies of multiply-excited states are covered. Some remaining problems, which require further attention, are discussed in more detail.

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Section: B2+mentioning

confidence: 99%

“…measured by Jacques et al [143]. In an experimental work of Blanke et al [148] also the lifetimes of ls2p3d 4P0, 4D0 were measured and from a cascade analysis the lifetime of the [144] a detailed experimental study was combined with extensive accurate calculations by Chung.…”

Section: B2+mentioning

confidence: 99%

Optical studies of multiply excited states

Mannervik¹

1989

Phys. Scr.

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“…The prerequisite for the validity of this approximation, an electronic transition outside a frozen core is fulfilled for the ls2s3d 4D levels but certainly not for the transitions involving the ls2p core. The results of this approximation are given in Tables I, 11.…”

mentioning

confidence: 99%

Beam-Foil Lifetimes of Doubly-Excitedn=3 States of Three-Electron Ions C³⁺-F⁶⁺

Blanke¹,

Heckmann²

1985

Phys. Scr.

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Decay curves of a number of n = 2 -n' = 3 transitions in the quartet term systems of C IV*, N V*, 0 VI*, and F VII* have been recorded.The extracted mean lives of n = 3 states are compared with other experimental data and with the results of several theoretical approximations. The results indicate that autoionization is not of major importance for the levels studied nor for the cascade-feeding states with high angular momentum.

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“…For the system of Li-like C , the transition probabilities of the 1s 2 2p 2 P o 1/2,3/2 → 1s 2 2s 2 S 1/2 transitions were measured by Berkner et al (1965) using the foil-excitation technique and by Knystautas et al (1971) using the beam-foil technique, respectively. There are also a number of measurements of lifetimes in C using the beam-foil technique (Donnelly et al 1978;Buchet-Poulizac & Buchet 1973b;Jacques et al 1980).…”

Section: Introductionmentioning

confidence: 99%

“…The transition rates of the 2p 2 P o 1/2,3/2 → 2s 2 S 1/2 transitions were measured by Knystautas et al (1971) using the beam-foil technique. By using the same technique, the lifetimes for a number of excited states were measured in four different experimental works (Donnelly et al 1978;Buchet-Poulizac & Buchet 1973b;Jacques et al 1980;Peach et al 1988). In Table A6, we compare the theoretical results, from present calculations and MCHF-BP calculations, with the NIST recommended values and observed values.…”

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confidence: 99%

Extended theoretical transition data in C I - IV

Li,

Amarsi,

Papoulia

et al. 2021

Preprint

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Accurate atomic data are essential for opacity calculations and for abundance analyses of the Sun and other stars. The aim of this work is to provide accurate and extensive results of energy levels and transition data for C -.The Multiconfiguration Dirac-Hartree-Fock and relativistic configuration interaction methods were used in the present work. To improve the quality of the wave functions and reduce the relative differences between length and velocity forms for transition data involving high Rydberg states, alternative computational strategies were employed by imposing restrictions on the electron substitutions when constructing the orbital basis for each atom and ion.Transition data, e.g., weighted oscillator strengths and transition probabilities, are given for radiative electric dipole (E1) transitions involving levels up to 1s 2 2s 2 2p6s for C , up to 1s 2 2s 2 7f for C , up to 1s 2 2s7f for C , and up to 1s 2 8g for C . Using the difference between the transition rates in length and velocity gauges as an internal validation, the average uncertainties of all presented E1 transitions are estimated to be 8.05%, 7.20%, 1.77%, and 0.28%, respectively, for C -. Extensive comparisons with available experimental and theoretical results are performed and good agreement is observed for most of the transitions. In addition, the C data were employed in a reanalysis of the solar carbon abundance. The new transition data give a line-by-line dispersion similar to the one obtained when using transition data that are typically used in stellar spectroscopic applications today.

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Line identifications and lifetime measurements in singly and doubly excited C IV and in C V

Abstract: Forty-eight new uv lines have been observed and identified in the singly and doubly excited systems of C IV, and in C V. The beam-foil technique was used to excite the spectra and to measure radiative lifetimes for 16 levels. Good agreement is found with available theoretical predictions.

Cited by 20 publications

References 1 publication

Optical studies of multiply excited states

Optical studies of multiply excited states

Beam-Foil Lifetimes of Doubly-Excitedn=3 States of Three-Electron Ions C³⁺-F⁶⁺

Extended theoretical transition data in C I - IV

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Line identifications and lifetime measurements in singly and doubly excited C IV and in C V

Abstract: Forty-eight new uv lines have been observed and identified in the singly and doubly excited systems of C IV, and in C V. The beam-foil technique was used to excite the spectra and to measure radiative lifetimes for 16 levels. Good agreement is found with available theoretical predictions.

Cited by 20 publications

References 1 publication

Optical studies of multiply excited states

Optical studies of multiply excited states

Beam-Foil Lifetimes of Doubly-Excitedn=3 States of Three-Electron Ions C3+-F6+

Extended theoretical transition data in C I - IV

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Beam-Foil Lifetimes of Doubly-Excitedn=3 States of Three-Electron Ions C³⁺-F⁶⁺