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DOUBLY IONIZED THORIUM: LASER LIFETIME MEASUREMENTS AND TRANSITION PROBABILITY DETERMINATION OF INTEREST IN COSMOCHRONOLOGY

机译:双电离T:激光寿命测量和跃迁概率测定

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摘要

The first lifetime measurements have been performed for six levels of doubly ionized thorium, an important cosmochronometer in astrophysics for estimating the age of the Galaxy. The levels, belonging to the 5f~2, 5f7p, 7s7p, and 6d7p configurations of Th Ⅲ, have been measured by the time-resolved laser-induced fluorescence method and compared with relativistic Hartree-Fock calculations including configuration interaction and core-polarization effects. Taking advantage of the excellent agreement between theory and experiment, a first set of transition probabilities of astrophysical interest has been deduced for this ion from a combination of the experimental lifetimes and of the theoretical branching fractions.
机译:已经对六种水平的双离子ized进行了首次寿命测量,这是天体物理学中重要的宇宙时计,用于估算银河系的年龄。用时间分辨激光诱导荧光法测量了ThⅢ的5f〜2、5f7p,7s7p和6d7p构型水平,并与相对论性Hartree-Fock计算(包括构型相互作用和核极化效应)进行了比较。 。利用理论和实验之间的极好的一致性,从实验寿命和理论支化分数的组合中推导出了该离子的第一组天体物理学感兴趣的跃迁概率。

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