Hyperfine structure measurements of the even electron levels in scandium atom

Krzykowski, A.; Stefańska, Danuta

doi:10.1088/0953-4075/41/5/055001

Cited by 8 publications

(6 citation statements)

References 19 publications

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“…The hf constants of odd parity levels of Sc I belonging to the configurations 3d 2 (4p + 5p), 3d4s(4p + 5p), and 4s 2 4p and hf constants of even levels belonging to the configurations 3d4p 2 , 3d 2 (4s + 5s + 4d), 3d 3 , 3d4s(5s + 6s + 4d + 5d), 4s 2 4d have been determined. A total of 199 hf constants of Sc I are determined, and the results are compared with the hf constants determined by [1,13,[15][16][17]21]. All the hf constants agree well within the uncertainty values, except for odd levels 43252 and 44105 cm −1 & for even levels, 36515, 42937, 43597, 44838, and 45870 cm −1 where the hf constants determined in this study differ from the work of others.…”

Section: Discussionsupporting

confidence: 48%

“…Singh et al [11] and Başar et al [12] used the laser opto-galvanic method to obtain the HFS constants of 20 levels of the 3d 2 4s, 3d4s4p, 3d4s5s, and 3d 2 4p configurations. Using the laser-induced fluorescence method in hollow cathode discharge, Krzykowski & Stefańska measured the magnetic dipole HFS constants A for 19 levels [13]. Fourier transforms (FT) spectroscopy was exploited by Aboussaïd et al [14], Van Deelen [15], Xu et al [16], and Hala & Nave [17] to determine a huge number of HFS constants for Sc I levels.…”

Section: Introductionmentioning

confidence: 99%

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Hyperfine structure constants of Sc I determined from fourier transform spectra

Kaleem,

Uddin,

et al. 2023

Phys. Scr.

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Fourier Transform Spectra of Scandium were analyzed, and hyperfine structure constants of odd and even levels of the configurations 3d2(4p+5p+4s+5s+4d), 3d4s(4p+5p+5s+6s+4d+5d), 3d3, 3d4p2,and 4s2(4p+4d) are determined. The hyperfine structures extracted from FT spectra were simulated and fitted to find the hf structure constants. A total of 104 even levels and 95 odd levels hf constants of Sc I are determined. The values of hf constants were compared with the published data, and a good agreement was found between them. The hf constants of 10 odd and 11 even levels are new. Seven hf constants values have been modified. Two software Fitter programs and classification of spectral lines were used to fit and simulate the spectral line’s hyperfine structure in Scandium’s FT spectra.

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Section: Discussionsupporting

confidence: 48%

Section: Introductionmentioning

confidence: 99%

Hyperfine structure constants of Sc I determined from fourier transform spectra

Kaleem,

Uddin,

et al. 2023

Phys. Scr.

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“…In the work of van Deelen [12], synthetic model spectra of Sc I hyperfine structure (HFS) multiplets were constructed and fitted to experimentally measured spectra. The results were compared to similar results from the literature [16][17][18][19][20][21][22][23], and investigations were initiated to examine the significant differences more closely. The work of van Deelen [12] can be considered the most recent and accurate compilation of Sc I HFS data for the near infrared wavelength region.…”

Section: Analyzing the Hyperfine Structurementioning

confidence: 99%

Atomic Data Needs in Astrophysics: The Galactic Center “Scandium Mystery”

Thorsbro

2020

Atoms

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Investigating the Galactic center offers unique insights into the buildup and history of our Galaxy and is a stepping stone to understand galaxies in a larger context. It is reasonable to expect that the stars found in the Galactic center might have a different composition compared to stars found in the local neighborhood around the Sun. It is therefore quite exciting when recently there were reports of unusual neutral scandium, yttrium, and vanadium abundances found in the Galactic center stars, compared to local neighborhood stars. To explain the scandium abundances in the Galactic center, we turn to recent laboratory measurements and theoretical calculations done on the atomic oscillator strengths of neutral scandium lines in the near infrared. We combine these with measurements of the hyper fine splitting of neutral scandium. We show how these results can be used to explain the reported unusual scandium abundances and conclude that in this respect, the environment of the Galactic center is not that different from the environment in the local neighborhood around the sun.

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“…The hollow-cathode lamp has a similar construction as described in Refs. [18,19]: The cathode is a 2.5 cm long copper cylinder with an inner diameter of 6 mm, covered by a thorium foil on the inner wall, and is cooled by liquid nitrogen. The discharge is operated at a current of 40 mA with argon buffer gas at a pressure between 80 Pa and 100 Pa. A 5 mW laser beam from the 402 nm ECDL, resonant with the 0 3/2 -24874 5/2 transition, is directed through the FIG.…”

Section: Single-wavelength Lasermentioning

confidence: 99%

Two-photon laser excitation of trapped232Th+ions via the 402-nm resonance line

et al. 2012

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Experiments on one-and two-photon laser excitation of 232 Th + ions in a radiofrequency ion trap are reported. As the first excitation step, the strongest resonance line at 402 nm from the (6d 2 7s)J =3/2 ground state to the (6d 7s7p)J =5/2 state at 24874 cm −1 is driven by radiation from an extended cavity diode laser. Spontaneous decay of the intermediate state populates a number of low-lying metastable states, thus limiting the excited state population and fluorescence signal obtainable with continuous laser excitation. We study the collisional quenching efficiency of helium, argon, and nitrogen buffer gases, and the effect of repumping laser excitation from the three lowestlying metastable levels. The experimental results are compared with a four-level rate equation model, that allows us to deduce quenching rates for these buffer gases. Using laser radiation at 399 nm for the second step, we demonstrate two-photon excitation to the state at 49960 cm −1 , among the highest-lying classified levels of Th + . This is of interest as a test case for the search for higher-lying levels in the range above 55000 cm −1 which can resonantly enhance the excitation of the 229 Th + nuclear resonance through an inverse two-photon electronic bridge process.

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Hyperfine structure measurements of the even electron levels in scandium atom

Cited by 8 publications

References 19 publications

Hyperfine structure constants of Sc I determined from fourier transform spectra

Hyperfine structure constants of Sc I determined from fourier transform spectra

Atomic Data Needs in Astrophysics: The Galactic Center “Scandium Mystery”

Two-photon laser excitation of trapped232Th+ions via the 402-nm resonance line

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