Berlin 2001 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
A: Atomphysik
A 17: Posters Friday (Spectroscopy)
A 17.51: Poster
Freitag, 6. April 2001, 12:30–15:00, AT3
Time-resolved laser spectroscopy of multiply ionized atoms–Natural radiative lifetime in Ce IV — •Zhiguo G. Zhang1, Sune Svanberg1, Pascal Quinet2,3, Patrick Palmeri3, and Émile Biémont2,3 — 1Department of Physics, Lund Institute of Technology, Sweden — 2IPNAS, Université de Liège, Belgium — 3Astrophysique et Spectroscopie, UMH, Belgium
Natural radiative lifetimes have been measured for two excited levels of Ce
IV using the time-resolved laser-induced fluorescence technique. Triply
ionized Ce atoms were produced in a laser-induced plasma. In the
measurements, a suitable magnetic field was applied to eliminate the
background light and reduce possible collisions, and special care was
exercised to avoid flight-out-of-view effects on the lifetime measurements
for the high velocity ions. The experimental lifetime results, τ = 30
(2) ns for the level 49737 cm−1 and τ = 30 (3) ns for the level
52226 cm−1, were compared with Relativistic Hartree-Fock calculations
(τ = 30.5 and 30.0 ns) indicating a particularly excellent agreement.
This work opens a new perspective for reliable lifetime (and consequently
oscillator strengths) determination of astrophysical interest for multiply
ionized atoms.
Acknowledgements
EB, PQ and PP are respectively Research Director, Research
Associate and Postdoctoral Researcher of the Belgian National
Fund for Scientific Research (FNRS).
This work was in part financially supported by the Swedish Natural Science
Research Council and by the EU-TMR access to Large-Scale facility programme
(contract ERBFMGECT 950020).