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Astron. Astrophys. 326, 412-416 (1997)

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

U. Berzinsh * 1, S. Svanberg 1 and E. Biémont 2

1 Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, Sweden
2 Institut d'Astrophysique, Université de Liège, 5, Avenue de Cointe, B-4000 Liège, Belgium

Received 4 November 1996 / Accepted 11 February 1997


Radiative lifetimes for the levels of the 3s2 3p2 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.

Key words: atomic data – Sun: atmosphere

* On leave from the Institute of Atomic Physics and Spectroscopy, University of Latvia, 19 Rainis Blvd., LV-1586 Riga, Latvia.

Send offprint requests to: U. Berzinsh


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© European Southern Observatory (ESO) 1997

Online publication: April 20, 1998