Experimental Ti i oscillator strengths and their application to cool star analysis

• Published in: Monthly notices of the Royal Astronomical Society Vol. 373; no. 4; pp. 1603 - 1609
• Main Authors: Blackwell-Whitehead, R. J., Lundberg, H., Nave, G., Pickering, J. C., Jones, H. R. A., Lyubchik, Y., Pavlenko, Y. V., Viti, S.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Publishing Ltd 21.12.2006; Oxford University Press
• Subjects: atomic data; Fluorescence; Fourier transforms; Light; Spectrum analysis; star: abundances; Stars & galaxies; techniques: spectroscopic; atomic data; star: abundances; techniques: spectroscopic
• ISSN: 0035-8711; 1365-2966
• DOI: 10.1111/j.1365-2966.2006.11161.x

We report experimental oscillator strengths for 88 Ti i transitions covering the wavelength range 465–3892 nm, 67 of which had no previous experimental values. Radiative lifetimes for 13 energy levels, including the low energy levels 3d2(3F) 4s4p (3P) z 5D°j, have been measured using time-resolved laser-induced fluorescence. Intensity-calibrated Ti i spectra have been measured using Fourier transform spectroscopy to determine branching fractions for the decay channels of these levels. The branching fractions are combined with the radiative lifetimes to yield absolute transition probabilities and oscillator strengths. Our measurements include 50 transitions in the previously unobserved infrared region λ > 1.0 μm, a region of particular interest to the analysis of cool stars and brown dwarfs.