Lifetime measurements of odd-parity high-excitation levels of Sm II by time-resolved laser spectroscopy

Astronomy and Astrophysics – Astronomy

Scientific paper

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Atomic Data, Atomic Processes, Methods: Laboratory, Techniques: Spectroscopic

Scientific paper

Natural radiative lifetimes of 53 odd-parity highly excited levels of singly ionized samarium in the energy range 26 599.08-36 107.66 cm-1 have been measured by the time-resolved laser-induced fluorescence technique in an ionic plume produced by laser ablation. The fundamental frequency and second harmonic of a dye laser have been adopted as the tunable exciting source (308-650 nm), and a fast detection system has been used to record fluorescence signals. The lifetime values obtained in this paper are in the range 10.5-271 ns. A good agreement between the present results and the previously published values was achieved. This work will be useful for investigating the composition of chemically peculiar stars.

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