Experimental and theoretical radiative lifetimes, branching fractions and
oscillator strengths for Lu I and experimental lifetimes for Lu II and Lu III
J.A. Fedchak, E.A. Den Hartog, J.E. Lawler, P. Palmeri,
P. Quinet and E. Biémont
Astrophys. J. (in press, 2000)
Accurate radiative lifetimes 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 U.S. National Solar Observatory 1.0 m Fourier transform
spectrometer are reported. The branching fractions are combined with the
radiative lifetimes to produce 44 accurate, experimentally determined
oscillator strengths for Lu I. New theoretical values for Lu I radiative
lifetimes and branching fractions from a relativistic Hartree-Fock
calculation which includes core polarization effects are also reported.
These experimental and theoretical results, as well as older published
results, are compared.
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