Experimental and Theoretical Radiative Lifetimes, Branching Fractions, and Oscillator Strengths for Lu I and Experimental Lifetimes for Lu II and Lu III

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.

[1]  É. Biémont,et al.  Theoretical Oscillator Strengths in Pr III and Application to Some CP Stars , 2000 .

[2]  É. Biémont,et al.  Theoretical Lifetimes and Oscillator Strengths in Ce II. Application to the Chemical Composition of the Sun , 2000 .

[3]  J. Lawler,et al.  Radiative lifetimes of Ho i and Ho ii , 1999 .

[4]  J. Lawler,et al.  Experimental and theoretical radiative lifetimes, branching fractions and oscillator strengths in Lu ii , 1999 .

[5]  É. Biémont,et al.  Radiative lifetimes in La III and oscillator strengths in La III and Lu III , 1999 .

[6]  É. Biémont,et al.  On the use of the Cowan's code for atomic structure calculations in singly ionized lanthanides , 1999 .

[7]  É. Biémont,et al.  Theoretical investigation of neutral francium , 1998 .

[8]  É. Biémont,et al.  Lifetime calculations in Yb II , 1998 .

[9]  C. Cowley,et al.  A Re-Evaluation of the Abundance of Lutetium in the Sun , 1998 .

[10]  E. A. Den Hartog,et al.  Spectroscopic Data for the 6it s6it p3 P1 level of Lu+ for the Determination of the Solar Lutetium Abundance , 1998 .

[11]  J. Lawler,et al.  Radiative lifetimes of Dy i and Dy ii , 1997 .

[12]  G. Preston,et al.  The Ultra--Metal-poor, Neutron-Capture--rich Giant Star CS 22892-052 , 1996 .

[13]  C. Sneden,et al.  First Detection of Platinum, Osmium, and Lead in a Metal-Poor Halo Star: HD 126238 , 1996 .

[14]  J. Tomkin,et al.  The r-process element europium in galactic disk F and G dwarf stars , 1995 .

[15]  STELLAR POPULATION AND ABUNDANCE STUDIES AT HIGH RESOLUTION WITH VERY LARGE TELESCOPES , 1995 .

[16]  J. Lawler,et al.  Radiative lifetimes in Co i , 1995 .

[17]  Weiss Aw.  Multireferent superposition-of-configurations calculations of core-correlation effects on energy levels and oscillator strengths: Be and B+ , 1995 .

[18]  K. Cunha,et al.  The chemical composition of omega centauri. I. Heavy-element abundances of seven warm giants , 1995 .

[19]  W. Whaling,et al.  Argon branching ratios for spectrometer response calibration , 1993 .

[20]  Ji,et al.  Beam-laser lifetime measurements for low-lying quartet states in Fe II. , 1992, Physical review. A, Atomic, molecular, and optical physics.

[21]  S. Svanberg,et al.  Accurate time-resolved laser spectroscopy on sputtered metal atoms , 1989 .

[22]  M. Levenson,et al.  Lasers, Spectroscopy and New Ideas: A Tribute to Arthur L. Schawlow , 1989 .

[23]  J. Lawler,et al.  Radiative lifetimes of even- and odd-parity levels in Sc i and Sc ii , 1988 .

[24]  S. Hashiguchi,et al.  Experimentally Determined Branching Ratios for Transitions in ArII , 1985 .

[25]  Shuzo Hattori,et al.  Accurate oscillator strengths for neutral helium , 1984 .

[26]  A. Hibbert.  Transitions in the cadmium sequence , 1982 .

[27]  K. Danzmann,et al.  Argon branching ratios for spectral intensity calibration: a reply , 1982 .

[28]  J. Migdalek.  One-electron spectrum of Yb+: Relativistic energies, transition probabilities and dipole polarizability , 1982 .

[29]  A. Hibbert.  Model Potentials in Atomic Structure , 1982 .

[30]  R. D. Cowan,et al.  The Theory of Atomic Structure and Spectra , 1981 .

[31]  D. Adams,et al.  Argon branching ratios for spectral-intensity calibration , 1981 .

[32]  M. Kwiatkowski,et al.  Laserspectroscopic Investigations in the Configuration 5d6s6p of Lu I , 1980 .

[33]  W. E. Baylis,et al.  Influence of atomic core polarisation on oscillator strengths for 2S1/2-2P1/2,3/2 and 2P1/2,3/2-2D3/2,5/2 transitions in Cu I, Ag I and Au I spectra , 1978 .

[34]  J. Wyart,et al.  Infrared Emission Spectrum of Lutecium and Extended Analysis of Lu I , 1978 .

[35]  W. C. Martin,et al.  Atomic Energy Levels - The Rare-Earth Elements. The Spectra of Lanthanum, Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, and Lutetium, , 1978 .

[36]  W. Ott,et al.  Vacuum ultraviolet radiometry. 3: The argon mini-arc as a new secondary standard of spectral radiance. , 1977, Applied optics.

[37]  Serafin Fraga,et al.  Handbook of atomic data , 1976 .

[38]  P. Ramanujam,et al.  Lifetimes of some excited states in the rare earths: La ii, Ce ii, Pr ii, Nd ii, Sm ii, Yb i, Yb ii, and Lu ii , 1975 .

[39]  C. Corliss,et al.  Tables of Spectral-Line Intensities: Part 1, Arranged by Elements , 1975 .

[40]  G. Sorensen,et al.  Determinations of atomic lifetimes for the rare earth ions: Prii, Tmii, Luii, Ceiii , 1974 .

[41]  R. Zalubas,et al.  Atomic energy levels - The rare-Earth elements , 1974 .

[42]  S. Hameed.  Core polarization corrections to oscillator strengths and singlet-triplet splittings in alkaline earth atoms , 1972 .

[43]  L. Göbel.  Zur Fein-und Hyperfeinstruktur von Lu I , 1971 .

[44]  L. Göbel.  Doppelresonanzuntersuchung in angeregten Zuständen von Lu I/ Double Resonance Investigation in Excited States of Lu I , 1970 .

[45]  L. Göbel.  Level-crossing-Experimente in angeregten Termen des Lu I zur Untersuchung der Hyperfeinstruktur von 175 Lu / Hyperfine Structure Investigations of Excited States of Lu I by Means of the Level-crossing Method , 1970 .

[46]  C. E. Moore,et al.  The Solar Spectrum 2935 Å to 8770 Å , 1966 .