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Lifetime determinations for eleven levels in La II and two levels in La III have been performed using time-resolved laser spectroscopy. Free La+ and La++ ions were produced in a laser-induced plasma and selective excitation was obtained with narrow-bandwidth, 1 ns duration tunable laser pulses. Lifetime values were evaluated from the time-resolved fluorescence signals recorded by a fast detection system. The La III data are believed to be the first ones obtained for a doubly charged lanthanide ion by laser spectroscopy. The results are compared with previous measurements by other authors.
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Z.S. Li (1999) studied this question.
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