Radiative lifetimes of highly excited odd-parity levels of neutral lanthanum
College of Physics, Jilin University, Changchun
2 Key Lab of Coherent Light, Atomic and Molecular Spectroscopy, Ministry of Education, Changchun 130012, P.R. China
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Received in final form: 25 August 2011
Published online: 22 November 2011
New radiative lifetimes of 24 high-lying odd-parity levels of neutral lanthanum are reported using time-resolved laser-induced fluorescence (TR-LIF) spectroscopy. The investigated levels ranging from 34 213 to 40 910 cm-1 were excited from the ground or metastable states using one-photon excitation. La atoms are produced by laser ablation on a solid La sample. The lifetimes were evaluated from transient LIF signals detected with a fast detection system. The obtained lifetime results, generally with uncertainties less than ±7%, are in the range from 15.7 to 121 ns.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2011