Experimental and theoretical radiative lifetimes, branching fractions, and oscillator strengths for LuI and experimental lifetimes for LuII and LuIII

被引:60
作者
Fedchak, JA [1 ]
Der Hartog, EA
Lawler, JE
Palmeri, P
Quinet, P
Biémont, E
机构
[1] Univ Wisconsin, Dept Phys, Madison, WI 53706 USA
[2] Univ Mons, B-7000 Mons, Belgium
关键词
atomic data; methods : laboratory; nuclear reactions; nucleosynthesis; abundances;
D O I
10.1086/317034
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Radiative lifetimes, accurate in most cases to +/-5%, from time-resolved, laser-induced fluorescence measurements on a slow beam of lutetium atoms and ions are reported for 22 odd-parity levels and 4 even-parity levels of Lu I and 14 odd-parity levels of Lu II. In addition, we report the radiative lifetime of one odd-parity level and an upper bound on the radiative lifetime of a second odd-parity level of Lu III. Experimental branching fractions for Lu I from emission spectra covering the near ultraviolet to the near infrared and recorded using the US National Solar Observatory 1.0 m Fourier transform spectrometer are reported. The branching fractions are combined with the radiative lifetimes to produce 44 experimentally determined transition probabilities or oscillator strengths, accurate generally to +/-10%, for Lu I. New theoretical values for Lu I radiative lifetimes and branching fractions from a relativistic Hartree-Fock calculation that includes core polarization effects are also reported. These experimental and theoretical results, as well as older published results, are compared.
引用
收藏
页码:1109 / 1118
页数:10
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