Fourier-transform-spectroscopy measurements in the spectra of neutral lithium,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">I</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>6</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvarian

Radziemski, Leon J.; Engleman, Rolf; Brault, J. W.

doi:10.1103/physreva.52.4462

Cited by 95 publications

(87 citation statements)

References 41 publications

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“…Thus, it is our belief that the error bars quoted in Ref. [17] for the value of the 4d-4f separation ( E 4d,4f = 4.99 ± 0.005 cm −1 ) do not reflect the accuracy in the field-free limit.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the Li I 4d–4f Energy Separation Using Active Spectroscopy

Tsigutkin¹,

Stambulchik²,

Maron³

et al. 2005

Phys. Scr.

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An accurate knowledge of the Li i 4d-4f energy separation is essential for the determination of electric fields, as is pursued using several modern diagnostic techniques. However, there is a rather large spread in the values of this quantity in the available data sources. We have measured the Li i 4d-4f energy separation using a technique that combines laser-induced-fluorescence with the utilization of collisional excitations. The plasma used for these measurements is laser-produced, which allows for selection of an electron-density range for which line shifts due to the plasma microfields are sufficiently small. An observation of the forbidden 2p-4f line provides the information on the microfields that allows for accounting for the Stark-shifts and evaluating the 4d-4f energy separation in the field-free limit. A comparison of the measured value with a few previous measurements allows for resolving the uncertainties in this quantity.

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Section: Introductionmentioning

confidence: 99%

“…In a more recent experimental work by Radziemski et al [17], the 2p−4d and 3d−4f wavelengths were measured with a high accuracy. However, the authors note that although accurate, the values they obtain may be different from these that would be observed in field-free conditions.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Li I 4d–4f Energy Separation Using Active Spectroscopy

Tsigutkin¹,

Stambulchik²,

Maron³

et al. 2005

Phys. Scr.

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“…We observed only one line (2149.871 cm -1 ) not reported by Radziemski et al (1995). In total, in the range 900−2200 cm -1 , we found four lines that had not been previously measured.…”

Section: Resultsmentioning

confidence: 47%

“…In their quite comprehensive study of the Li I spectrum, Radziemski et al (1995) reported 34 lines in the 1829−30 925 cm -1 range. We observed only one line (2149.871 cm -1 ) not reported by Radziemski et al (1995).…”

Section: Resultsmentioning

confidence: 99%

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Li I spectra in the 4.65–8.33 micron range: high-Lstates and oscillator strengths

Civiš

Ferus

Kubelík

et al. 2012

A&A

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Context. Infrared (IR) astronomy capacities have rapidly developed in recent years thanks to several ground-and space-based facilities. To take advantage of these capabilities efficiently, a large amount of atomic data (such as line wavenumber, excited-level energy values, and oscillator strengths) are needed. These data are incomplete, in particular, for lithium whose abundances are important for several astrophysical problems. Aims. No laboratory-measured spectra of Li I have been reported for wavelengths longward of 6.6 microns. We aim to find new Li I lines in the 4.65-8.33 microns range due to transitions between states with high orbital momentum (l ≥ 4) and to determine the excitation energies of these states. Methods. The Li I lines were studied using the time-resolved Fourier transform infrared spectroscopy of a plasma created by the laser ablation of a LiF target in a vacuum. The classification of the lines was performed by accounting for oscillator strengths ( f -values) calculated using quantum defect theory (QDT). The adequacy of QDT for these calculations was checked by comparison with the available experimental and theoretical results. Results. We report four new Li I lines in the 900-2200 cm -1 range that allow us to extract the excitation energies of the 6g, 6h, and 7h states of Li I, which have not been measured before. We also provide a large list of QDT-calculated f -values for Li I in the range of 1-20 microns.

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Equation‐of‐Motion Coupled‐Cluster Models

Musiał¹

2020

Quantum Chemistry and Dynamics of Excited States

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Fourier-transform-spectroscopy measurements in the spectra of neutral lithium,I6and

Cited by 95 publications

References 41 publications

Determination of the Li I 4d–4f Energy Separation Using Active Spectroscopy

Determination of the Li I 4d–4f Energy Separation Using Active Spectroscopy

Li I spectra in the 4.65–8.33 micron range: high-Lstates and oscillator strengths

Equation‐of‐Motion Coupled‐Cluster Models

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