Critically Evaluated Atomic Transition Probabilities for Ba <scp>I</scp> and Ba <scp>II</scp>

Klose, Jules Z.; Fuhr, Jeffrey R.; Wiese, Wolfgang L.

doi:10.1063/1.1448482

Cited by 62 publications

(36 citation statements)

References 23 publications

(41 reference statements)

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“…Klose et al 2002; (2)Lawler et al 2001a; (3) Palmeri et al 2000; (4) Den Hartog et al 2003; (5) Lawler et al 2006; (6) Lawler et al 2001b; (7 ) Den Hartog et al 2006; (8) Wickliffe et al 2000; (9) Biémont et al 2000; (10) Grevesse & Sauval 2002.…”

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confidence: 99%

Europium, Samarium, and Neodymium Isotopic Fractions in Metal‐Poor Stars

Roederer

Lawler

Sneden

et al. 2008

ApJ

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We have derived isotopic fractions of europium, samarium, and neodymium in two metal-poor giants with differing neutron-capture nucleosynthetic histories. These isotopic fractions were measured from new high-resolution (R $ 120;000), high signal-to-noise ratio (S/N $ 160Y1000) spectra obtained with the 2d-coudé spectrograph of McDonald Observatory's 2.7 m Smith telescope. Synthetic spectra were generated using recent high-precision laboratory measurements of hyperfine and isotopic subcomponents of several transitions of these elements and matched quantitatively to the observed spectra. We interpret our isotopic fractions by the nucleosynthesis predictions of the stellar model, which reproduces s-process nucleosynthesis from the physical conditions expected in low-mass, thermally pulsing stars on the AGB, and the classical method, which approximates s-process nucleosynthesis by a steady neutron flux impinging on Fe-peak seed nuclei. Our Eu isotopic fraction in HD 175305 is consistent with an r-process origin by the classical method and is consistent with either an r-or an s-process origin by the stellar model. Our Sm isotopic fraction in HD 175305 suggests a predominantly r-process origin, and our Sm isotopic fraction in HD 196944 is consistent with an s-process origin. The Nd isotopic fractions, while consistent with either r-process or s-process origins, have very little ability to distinguish between any physical values for the isotopic fraction in either star. This study for the first time extends the n-capture origin of multiple rare earths in metal-poor stars from elemental abundances to the isotopic level, strengthening the r-process interpretation for HD 175305 and the s-process interpretation for HD 196944.

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confidence: 99%

Europium, Samarium, and Neodymium Isotopic Fractions in Metal‐Poor Stars

Roederer

Lawler

Sneden

et al. 2008

ApJ

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“…The mean dipole moment for the transition |0 → |1 is well known to be μ 1 ≈ 8 D. As regards the dipole moment for the transition |1 → |2 , we chose the value published in Ref. [13], μ 2 ≈ 0.7 D, which seems quite accurate [14].…”

Section: A Setupmentioning

confidence: 99%

Kerr-free propagation of a near-resonant laser in an atomic vapor

2014

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In this paper, we address the propagation of a near resonant laser inside an atomic vapor in the case when, due to the Kerr effect, the laser beam would either self-focus or self-defocus. We show, both theoretically and experimentally, how to get rid of such an alteration in the transverse beam profile without changing any of the characteristics of the laser light under consideration (wavelength, intensity, etc.), nor of the atomic vapor. Moreover, our proposed method offers a lot of control on the beam profile, whose transverse size after propagation may be chosen at will by making use of a second, copropagating laser, whose required wavelength and intensity may be derived analytically. APPENDIX: THREE-LEVEL SYSTEM WITH HYPERFINE STRUCTURE.Let us now address the derivation of the polarization, P , when the atoms have a hyperfine structure. As explained in Sec. IIB1, a given hyperfine level, denoted by |J i ,F i ,m i , is identified by the kinetic momentum, J i , of its fine level |i , by the value of its total kinetic momentum, F i = J i + I, where I is the nuclear spin, and by the projection, m i , of F i along the direction of the laser's electric fields. Because hyperfine sublevels are very close to each other, one needs to account for all allowed transitions, F = 0, ± 1, between two given 013849-7

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“…atomic transition probability for this transition. [3,51] This method is repeated at progressively increasing energy levels until no emission lines are found that correspond with dipole allowed transitions.…”

Section: Plume Imagerymentioning

confidence: 99%

“…[56] Finally, most of the prior work predates a significant revision in transition probabilities for many relevant emission lines. [51] Because of the many experimental deficiencies in prior work, and the lack of follow-through on the apparent contradictions between assertion of the presence of LTE and measured electronic temperatures, emission spectroscopy of laser-ablated YBCO plumes is ripe for reexamination using a systematic experimental approach to address prior deficiencies in technique, as well as a critical look at electronic excitation mechanisms in the plume.…”

Section: Introductionmentioning

confidence: 99%

Electronic State Distributions of YBa₂Cu₃O_7-x Laser-Ablated Plumes

Kee

Perram

2010

Appl Spectrosc

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The application of spectral and imagery diagnostics to YBa 2 Cu 3 O 7 (YBCO) laser-ablated plumes was systematically studied to determine their effectiveness for process control. Emission signatures were collected for plumes created by ablating bulk YBCO with a pulsed laser source. A KrF (λ=248 nm) laser source operating at 4-10 J/cm 2 at a 4-10 Hz pulse repetition frequency was used to ablate a bulk YBCO target at O 2 background pressures ranging from 50 to 400 mTorr. Emission spectra were collected over the 500 to 860 nm bandpass at distances from the target ranging from 31.4 to 55.0 mm. Of 87 observed emission lines, 76 were assigned to specific transitions with the aid of calibration lamps and reference to tables of energy levels. Line fluences were corrected for self-absorption, and electronic state distributions were calculated using the most recent NIST transition probabilities.

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Critically Evaluated Atomic Transition Probabilities for Ba I and Ba II

Abstract: Atomic transition probabilities for allowed and forbidden lines of Ba I and Ba II are tabulated, based on a critical evaluation of recent literature sources. The data are presented in multiplet format and are ordered by increasing excitation energies.

Cited by 62 publications

References 23 publications

Europium, Samarium, and Neodymium Isotopic Fractions in Metal‐Poor Stars

Europium, Samarium, and Neodymium Isotopic Fractions in Metal‐Poor Stars

Kerr-free propagation of a near-resonant laser in an atomic vapor

Electronic State Distributions of YBa₂Cu₃O_7-x Laser-Ablated Plumes

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Critically Evaluated Atomic Transition Probabilities for Ba I and Ba II

Abstract: Atomic transition probabilities for allowed and forbidden lines of Ba I and Ba II are tabulated, based on a critical evaluation of recent literature sources. The data are presented in multiplet format and are ordered by increasing excitation energies.

Cited by 62 publications

References 23 publications

Europium, Samarium, and Neodymium Isotopic Fractions in Metal‐Poor Stars

Europium, Samarium, and Neodymium Isotopic Fractions in Metal‐Poor Stars

Kerr-free propagation of a near-resonant laser in an atomic vapor

Electronic State Distributions of YBa2Cu3O7-x Laser-Ablated Plumes

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Product

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Electronic State Distributions of YBa₂Cu₃O_7-x Laser-Ablated Plumes