First Spark Spectrum of Neodymium—Preliminary Classification and Zeeman Effect Data

Albertson, Walter; Harrison, George R.; McNally, J. Rand

doi:10.1103/physrev.61.167

Cited by 37 publications

(8 citation statements)

References 11 publications

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“…The energy levels of Nd II, as compiled by the NIST (Martin, Zalubas & Hagan 1978, http://physics.nist.gov/cgi-bin/AtData/ main asd), were obtained from previous investigations carried out by Albertson, Harrison & McNally (1942) and Schuurmans (1946) and from more recent analyses of Nd I and Nd II spectra performed at the Zeeman Laboratory of Amsterdam and at the Laboratoire Aimé Cotton in Paris (Wyart 1968;Hoekstra 1969;Blaise et al 1970;Morillon 1970;Blaise et al 1971). A revised interpretation of the Nd II spectrum, with help of the 144 Nd-150 Nd isotope shift, has been made by Blaise & Wyart (1984) who considered the complete system of levels of Nd II built on the core f 3 , proposed 126 new levels and revised 96 previous values.…”

Section: T H E S P E C T Ru M O F N D I Imentioning

confidence: 99%

Radiative lifetime measurements in Er II by time-resolved laser spectroscopy

Jiang

Zhang

et al. 2003

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

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Radiative lifetime measurements were performed with time-resolved laser-induced fluorescence techniques for 24 levels of Nd II in the energy range 20 500-32 500 cm −1 . For 17 levels, no previous experimental data exist. These results have allowed the testing of new theoretical calculations with the relativistic Hartree-Fock method taking configuration interactions and core-polarization effects into account, and a satisfying agreement has been found for this complex ion. A new set of calculated oscillator strengths, accurate within a few per cent for the strongest transitions, is presented for 107 lines of astrophysical interest appearing in the wavelength range 358.0-1100.0 nm. These results will be useful to evaluate abundance values of neodymium in chemically peculiar stars in relation with cosmochronology.Key words: atomic data -atomic processes -stars: chemically peculiar. I N T RO D U C T I O NThe consideration of the r-process abundance patterns in some stars allows an age determination of the earliest galactic halo. In particular, the comparison of the abundances of the heavy elements (i.e. thorium and uranium) synthesized soon after the formation of our Galaxy with those of lighter stable neutron capture elements allows the estimation of the age of this halo. However, some singly ionized rare-earths, interesting for cosmochronometry (in relation with the third n-capture peak), have only poorly determined transition probabilities (Sneden, Lawler & Cowan 2002). As a consequence, narrowing the uncertainties in age estimates relies clearly on further improvements in r-process theory but also on high-resolution spectroscopy of very metal-poor stars itself depending upon accurate atomic data.The age of some very metal-poor stars (see e.g. Cayrel et al. 2001) can be estimated, by comparison of abundance ratios of radioactive and stable nuclear species, using different pairs of elements such as U/Th, U/Os and U/Ir. Nd II is one of the elements which can be used as a stable nuclear species in cosmochronology for estimating the age of the Galaxy (Lawler, Whaling & Grevesse 1990). The present study is mainly aimed at obtaining a new set of atomic data for this ion having in mind contribution to the cosmochronometry based on the pair U/Nd. E-mail: E.Biemont@ulg.ac.be In a more general context, accurate atomic data for lanthanide ions are required for refining the stellar elemental abundances and for more firmly establishing the odd-even effect observed in many stars: in fact the elements with an even atomic number appear generally more abundant than the odd elements. In some stars, however, this odd-even effect does not appear clearly because some of the lines (which are frequently only a few of them) used for deducing abundance values are affected by blending with the abundant elements (iron-group elements) and by possible unknown hyperfine structure effects.Singly ionized neodymium is frequently observed in astrophysical spectra and the analysis of Nd II lines leads to strong overabundance estimates of th...

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Section: T H E S P E C T Ru M O F N D I Imentioning

confidence: 99%

Radiative lifetime measurements in Er II by time-resolved laser spectroscopy

Jiang

Zhang

et al. 2003

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

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“…The experimental data from literature, presented in Table 1, are the results of measurements at fields up to 87 180 G [20], and at fields up to 20 000 G [21]. In our opinion it is of importance to work in the "weak" magnetic field regime, as the J value of a level remain a good quantum number for weak magnetic fields.…”

Section: Discussionmentioning

confidence: 98%

“…b Because many eigenfunctions have leading components smaller than 10% due to breakdown of LS coupling and CI effects, only leading components when larger than 50% are given. c Experimental uncertainties were not given in [20,21]. …”

Section: Discussionmentioning

confidence: 98%

Investigations of the Zeeman effect of some 142Nd ionic levels, using collinear laser ion beam spectroscopy

Werbowy

Hühnermann

Kwela

et al. 2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…[ 2] R e f . [ 27] theoretical studies [cm Experimental uncertainties were not given in [2,27]. Ref.…”

Section: Discussionmentioning

confidence: 99%

“…[ 2] R e f . [ 27] studies [cm Table 3. Discrepancies of some present Nd II level designations, between two available theoretical parametric studies (Refs.…”

Section: Discussionmentioning

confidence: 99%

Studies of Landé gJ-factors of singly ionized neodymium isotopes (142, 143 and 145) at relatively small magnetic fields up to 334 G by collinear laser ion beam spectroscopy

Werbowy

Windholz

2017

Eur. Phys. J. D

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Abstract. The Zeeman splitting at moderate magnetic fields (up to 334 G) of 20 lines of Nd II, covering the part 569.89 nm to 617.05 nm of the visible spectral range were investigated. We used a Doppler-free collinear laser ion beam spectroscopy technique supported by a precise computer analysis. From the Zeeman effect studies we re-investigated the Landé gJ factors for 20 odd levels between 22 850 and 30 002 cm and 11 even levels lying between 6005 and 12 460 cm −1 . We compared our data with other available experimental and theoretical values. We achieved an accuracy better than that of other authors, making our data valuable for future theoretical parametric studies.

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First Spark Spectrum of Neodymium—Preliminary Classification and Zeeman Effect Data

Cited by 37 publications

References 11 publications

Radiative lifetime measurements in Er II by time-resolved laser spectroscopy

Radiative lifetime measurements in Er II by time-resolved laser spectroscopy

Investigations of the Zeeman effect of some 142Nd ionic levels, using collinear laser ion beam spectroscopy

Studies of Landé gJ-factors of singly ionized neodymium isotopes (142, 143 and 145) at relatively small magnetic fields up to 334 G by collinear laser ion beam spectroscopy

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