Radiative Lifetimes of Eu
                    <scp>i</scp>
                    ,
                    <scp>ii</scp>
                    , and
                    <scp>iii</scp>
                    and Transition Probabilities of Eu
                    <scp>i</scp>

Hartog, E. A. Den; Wickliffe, M. E.; Lawler, J. E.

doi:10.1086/340039

Cited by 49 publications

(41 citation statements)

References 42 publications

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“…The chosen scaling factors are 0.55 for the 4f-5d transitions and 0.86 for the 6s-6p and 5d-6p transitions. The first scaling factor agrees with the Eu iii experimental lifetimes measured by Zhang et al (2000) and Den Hartog et al (2002) (same as , while the second one fits measured values of the lifetimes for the 5d-6p transitions in the second spectra of several lanthanides, for example, in Nd iii (Zhang et al 2002a; calculations by Ryabchikova et al 2006) and in Dy iii (Zhang et al 2002b; calculations by the present authors).…”

Section: But This Technique Does Not Work For Transitions 4fsupporting

confidence: 90%

“…In addition to the approach by Mashonkina et al (2002), the core polarisation effects were included in the calculations leading to a modification of ab initio transition integrals. As a result, about 10% deviation of calculated lifetimes for the 5d 8 P term levels from the most accurate measurements (Den Hartog et al 2002) was achieved. Calculated by , oscillator strengths for about 900 lines can be found in the dream data base created at Mons University (Biémont et al 1999).…”

Section: Introductionmentioning

confidence: 97%

“…These Table 5 is also available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/483/339 calculations led to transition probabilities lower than the astrophysical transition probabilities by about two orders of magnitude. However, in a comparison with the lifetime measurements of the 5d 8 P term levels (Zhang et al 2000;Den Hartog et al 2002), it was concluded that the calculated absolute transition probabilities could be overestimated by a factor of 3. Later, calculations of the Eu iii spectrum were performed by .…”

Section: Introductionmentioning

confidence: 99%

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Extended analysis of the Eu III spectrum

Wyart

Tchang-Brillet²,

Churilov

et al. 2008

A&A

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Aims. We create an Eu iii new atomic data set for interpreting the spectra of chemically peculiar stars by an extended analysis of the doubly-ionized europium.Methods. We classified Eu iii spectral lines from a laboratory wavelength list with the support of energy and transition probability predictions in the Racah-Slater approach, using the Cowan codes and generalized least-squares fit (GLS) studies along the sequence of doubly-ionized lanthanides.Results. More than thirty new levels and ninety classified lines are established in Eu iii. Improved prediction of the Eu iii spectrum was achieved by using scaling factors for ab initio energy integrals, as well as effective configuration interaction parameters supplied by GLS studies. Transition probabilities, oscillator strengths, and Landé g-factors are calculated for the lines in the region 2000-9995 Å.

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Section: But This Technique Does Not Work For Transitions 4fsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Extended analysis of the Eu III spectrum

Wyart

Tchang-Brillet²,

Churilov

et al. 2008

A&A

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“…They include electronic bandwidth limitations, cascade fluorescence, Zeeman quantum beats, and atomic motion time-of-flight effects, among others. These systematic effects are discussed in detail elsewhere (see, e.g., Den Hartog et al 1999Hartog et al , 2002 and will not be discussed further here. As a means of verifying that the measurements are within the stated uncertainties, we perform periodic end-to-end tests of the experiment by measuring a set of well-known lifetimes.…”

Section: Radiative Lifetime Measurementsmentioning

confidence: 99%

Improved Laboratory Transition Probabilities for Smiiand Application to the Samarium Abundances of the Sun and Threer‐Process–rich, Metal‐poor Stars

Lawler

Hartog

Sneden

et al. 2006

ASTROPHYS J SUPPL S

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119

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Radiative lifetimes, accurate to AE5%, have been measured for 212 odd-parity levels of Sm ii using laser-induced fluorescence. The lifetimes are combined with branching fractions measured using Fourier transform spectrometry to determine transition probabilities for more than 900 lines of Sm ii. This work is the largest scale laboratory study to date of Sm ii transition probabilities using modern methods. This improved data set has been used to determine a new solar photospheric Sm abundance, log ¼ 1:00 AE 0:03, from 26 lines. The spectra of three very metal-poor, neutroncapture-rich stars also have been analyzed, employing between 55 and 72 Sm ii lines per star. The abundance ratios of Sm relative to other rare earth elements in these stars are in agreement and are consistent with ratios expected from rapid neutron-capture nucleosynthesis (the r-process).

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“…The NIST Atomic Spectra Database references work from 1975, but more recent gas phase lifetime measurements of this and other P states of atomic Eu are now available. The most recent study 15 identified a lifetime of 870 ± 44 ns for the z 6 P 7/2 ↔ a 8 S 7/2 transition using laser induced fluorescence. Clearly there is a discrepancy between the solid state and the gas phase lifetimes recorded.…”

Section: Z 6 P State Lifetimementioning

confidence: 99%

Site-selected luminescence of atomic europium in the solid rare gases

Byrne

McCaffrey

2011

The Journal of Chemical Physics

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Site-selective excitation has been used to simplify complex emission recorded in the visible spectral region for atomic europium isolated in the solid rare gases. In addition to y 8 P resonance fluorescence, excitation of the y 8 P state produces emission from the z 6 P state and the metastable a 10 D state. Very weak emission at 690 nm is tentatively assigned to the J = 9/2 level of the z 10 P state. Eu atoms isolated in the red and blue sites exhibit very different temperature dependence both spectrally and temporally. For the y 8 P state emission the red site atoms exhibit small Stokes shifts and yield radiative lifetimes while the emission from the blue site loses intensity and the temporal profiles shorten dramatically between 10 and 16 K indicating very efficient non-radiative relaxation in this site. An analysis of the Stokes shifts exhibited for the y 8 P state in each site supports the attributions made in a previous publication [O. Byrne and J.G. McCaffrey, J. Chem. Phys. 134, 124501 (2011)] that the smaller blue tetravacancy site has a greater repulsive interaction with the guest. With the exception of the y 8 P state resonance fluorescence, the recorded decay profiles of all the other emissions exhibit multiple components. This behaviour has been attributed to the existence of multiple crystal field levels arising from the splitting of the distinct spin-orbit levels from which emission occurs.

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Radiative Lifetimes of Eu i , ii , and iii and Transition Probabilities of Eu i

Cited by 49 publications

References 42 publications

Extended analysis of the Eu III spectrum

Extended analysis of the Eu III spectrum

Improved Laboratory Transition Probabilities for Smiiand Application to the Samarium Abundances of the Sun and Threer‐Process–rich, Metal‐poor Stars

Site-selected luminescence of atomic europium in the solid rare gases

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