Radiative lifetimes of nine levels in Eu II (4f 7 6p, 4f 6 5d6s and 4f 6 5d 2 ) and Eu III (4f 6 5d) have been measured using time-resolved laser-induced fluorescence spectroscopy on a laser-produced europium plasma. Oscillator strengths for a number of Eu II lines have been derived by combining the lifetimes with branching ratios measured in the emission spectrum of a hollow-cathode lamp.
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Zhiguo et al. (2000) studied this question.
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