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Your search keyword '"Biémont, E."' showing total 12 results
Start Over Author "Biémont, E." Publisher edp sciences
12 results on '"Biémont, E."'

1. Radiative lifetimes for the 4p excited states of phosphorus and the oscillator strengths of solar lines

Author

Uldis Berzins, Svanberg, S., and Biémont, E.

Subjects
Atom and Molecular Physics and Optics
Abstract

Radiative lifetimes for the levels of the 3s(2)3p(2)4p configuration in neutral phosphorus have been determined experimentally for the first time and also theoretically. Experiments were performed by using two-photon UV laser excitation and subsequent fluorescence detection in a laser-produced plasma. In relativistic Hartree-Fock calculations, the Cowan code extended to 42 configurations was used. Finally, the lifetimes for all the 13 excited states in the 4p configuration were calculated and for 6 of them the values were measured experimentally. Theoretical branching ratios were combined with experimental lifetimes, to deduce oscillator strengths and these were used for the evaluation of the phosphorus abundance in the sun. A value of 5.49 (0.04) was obtained in the usual logarithmic scale.

Published
1997

3. Radiative lifetime and oscillator strength determinations in Sm III

Author

Biémont, E, Garnir, H P, Litzén, Ulf, Nielsen, Krister, Quinet, P, Svanberg, Sune, Wahlgren, Glenn, Zhang, Zhiguo, Biémont, E, Garnir, H P, Litzén, Ulf, Nielsen, Krister, Quinet, P, Svanberg, Sune, Wahlgren, Glenn, and Zhang, Zhiguo

Abstract

Radiative lifetimes of 6 levels belonging to the4f5(6Hdeg,6Fdeg)5d configuration of Sm III have beenmeasured for the first time using a time-resolved laser-inducedfluorescence technique. Experimental data have been compared withsemi-empirical calculations. The agreement is excellent for 4 levelswith 6Fdeg as a parent term. Larger discrepancies(53 and 37) are observed for 2 levels with 6Hdegand 6Fdeg, respectively, as a parent term and areexplainable by strong mixing and cancellation effects occurring in theline strength calculations which are responsible of instabilitiesoccurring in the lifetimes considered as a function of J value withinthe term. Branching ratios for the lines depopulating the levels ofinterest have been measured by Fourier transform spectroscopy. A firstset of oscillator strengths has been deduced for this ion.

Published
2003

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