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An interference between electric quadrupole and Stark induced dipole amplitudes is observed for the first time. Measurement of this interference in atomic strontium permits the first experimental determination of the decay rate between the lowest ¹P and metastable ¹D levels in an alkaline-earth atom. We obtain the result A(5s5p-5s4d)=(3.85±{}0.94±{}0.5 3)×{}10³ s^-1.
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Hunter et al. (1986) studied this question.
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