Hyperfine Structure Constants and Isotope Shift Determination in ZrI   by Laser-Induced Fluorescence Spectroscopy

Lim, Changhwan; Nomaru, Keiji; Izawa, Yasukazu

doi:10.1143/jjap.37.5049

Cited by 13 publications

(11 citation statements)

References 9 publications

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“…The maximum shift between 90 Zr and 94 Zr in their list was 8 mÅ. Similar values have been reported by Bourauel et al (1987) and Lim et al (1998). This level of isotopic splitting is negligible in the context of the GES.…”

Section: Appendix B23: Zirconium (Z=40)supporting

confidence: 87%

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Atomic data for the Gaia-ESO Survey

Heiter

Lind

Bergemann

et al. 2021

A&A

136

142

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Context. We describe the atomic and molecular data that were used for the abundance analyses of FGK-type stars carried out within the Gaia-ESO Public Spectroscopic Survey in the years 2012 to 2019. The Gaia-ESO Survey is one among several current and future stellar spectroscopic surveys producing abundances for Milky-Way stars on an industrial scale. Aims. We present an unprecedented effort to create a homogeneous common line list, which was used by several abundance analysis groups using different radiative transfer codes to calculate synthetic spectra and equivalent widths. The atomic data are accompanied by quality indicators and detailed references to the sources. The atomic and molecular data are made publicly available in electronic form. Methods. In general, experimental transition probabilities were preferred but theoretical values were also used. Astrophysical g fvalues were avoided due to the model-dependence of such a procedure. For elements whose lines are significantly affected by a hyperfine structure or isotopic splitting, a concerted effort has been made to collate the necessary data for the individual line components. Synthetic stellar spectra calculated for the Sun and Arcturus were used to assess the blending properties of the lines. We also performed a detailed investigation of available data for line broadening due to collisions with neutral hydrogen atoms. Results. Among a subset of over 1300 lines of 35 elements in the wavelength ranges from 475 nm to 685 nm and from 850 nm to 895 nm, we identified about 200 lines of 24 species which have accurate g f-values and are free of blends in the spectra of the Sun and Arcturus. For the broadening due to collisions with neutral hydrogen, we recommend data based on Anstee-Barklem-O'Mara theory, where possible. We recommend avoiding lines of neutral species for which these are not available. Theoretical broadening data by R.L. Kurucz should be used for Sc ii, Ti ii, and Y ii lines; additionally, for ionised rare-earth species, the Unsöld approximation with an enhancement factor of 1.5 for the line width can be used. Conclusions. The line list has proven to be a useful tool for abundance determinations based on the spectra obtained within the Gaia-ESO Survey, as well as other spectroscopic projects. Accuracies below 0.2 dex are regularly achieved, where part of the uncertainties are due to differences in the employed analysis methods. Desirable improvements in atomic data were identified for a number of species, most importantly Al i, S i, and Cr ii, but also Na i, Si i, Ca ii, and Ni i.

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Section: Appendix B23: Zirconium (Z=40)supporting

confidence: 87%

“…HFS A and B constants can be found for 12 levels of Zr i inLim et al 1998, which correspond to the lower levels of some of our preselected lines.…”

supporting

confidence: 54%

Atomic data for the Gaia-ESO Survey

Heiter

Lind

Bergemann

et al. 2021

A&A

136

142

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“…In the same year, Chevalier et al [7] used intermodulated saturation spectroscopy and intermodulated polarization spectroscopy to determine HFS and IS for ten Zr I transitions in the range 573-614 nm. Recently, McLean et al [8] reported diode-laser saturated absorption measurements of HFS and IS for Zr I transitions in the range 785-839 nm, and Lim et al [9,10] used laser-induced fluorescence spectroscopy on an atomic beam to determine HFS and IS for 12 Zr I transitions in the range 570-610 nm. Some of the latter transitions involve high-lying, even-parity levels not listed in the NBS tables of Moore [11], and these HFS data provide a fingerprint for the assignment of these new levels.…”

Section: Introductionmentioning

confidence: 99%

Hyperfine structure of odd-parity levels in⁹¹ZrI

Bouazza

Gough

Hannaford

et al. 2000

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

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Hyperfine structures have been investigated for odd-parity 4d25s5p and 4d35p levels for six 91Zr I transitions in the spectral range 458-549 nm using Doppler-free saturated absorption spectroscopy in a sputtered vapour. The measured hyperfine structure constants, A and B, together with results of previous studies were analysed by means of a parametric method. The interpretation was based on refined multiconfigurational fine structure calculations, which include the main Rydberg series configuration states. The analysis suggests a drastic revision of the composition of the 4d5s25p configuration levels. The main one-electron hyperfine structure parameters for the lowest configuration, i.e. 4d25s5p, are determined to be a5s10 = -2672(61) MHz, a4d01 = -115.8(3.4) MHz, a5p01 = -127.4(3.7) MHz, b4d02 = -93.5(2.8) MHz and b5p02 = -139.9(5.1) MHz. These values are in excellent agreement with ab initio calculations, justifying our choice of the perturbing configuration states.

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“…2,3) However, the absorption spectra show that the isotope shifts are rather small and that all the absorption peaks of the even isotopes lie in the range of the hyperfine spectral spread of the odd isotope. [4][5][6] Therefore, it seems difficult to separate odd isotopes efficiently from even isotopes under such spectral conditions.…”

Section: Introductionmentioning

confidence: 99%

Isotopic Selectivity in Two-Color Multiphoton Ionization Spectroscopy of Zirconium

Niki

Takaaki

Motozu

2009

Jpn. J. Appl. Phys.

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A two-color multiphoton ionization spectroscopy of Zr has been performed using an atomic beam and pulsed dye lasers in conjunction with the use of a time-of-flight mass spectrometer. Zr atoms were excited from the ground state [4d 2 5s 2 ( 3 F 2 )] to the 17430 cm À1 state [4d 2 5s5p( 3 D 1 )] by one dye laser, and subsequently ionized by another dye laser. From the experiment, a total of 124 peaks originating from the 17430 cm À1 state were observed in the 565 -593 and 610 -652 nm regions. In addition 68 single-color multiphoton ionization peaks were observed. From the results of the ion mass analysis, isotopic selectivities between odd and even isotopes were observed at six ionization peaks. This suggests the existence of

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Hyperfine Structure Constants and Isotope Shift Determination in ZrI by Laser-Induced Fluorescence Spectroscopy

Cited by 13 publications

References 9 publications

Atomic data for the Gaia-ESO Survey

Atomic data for the Gaia-ESO Survey

Hyperfine structure of odd-parity levels in⁹¹ZrI

Isotopic Selectivity in Two-Color Multiphoton Ionization Spectroscopy of Zirconium

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Hyperfine Structure Constants and Isotope Shift Determination in ZrI by Laser-Induced Fluorescence Spectroscopy

Cited by 13 publications

References 9 publications

Atomic data for the Gaia-ESO Survey

Atomic data for the Gaia-ESO Survey

Hyperfine structure of odd-parity levels in91ZrI

Isotopic Selectivity in Two-Color Multiphoton Ionization Spectroscopy of Zirconium

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Product

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Hyperfine structure of odd-parity levels in⁹¹ZrI