Atomic Transition Probabilities in TiI

Details Atomic Transition Probabilities in TiI Atomic Transition Probabilities in TiI

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..dmp.d5027n&link_type=abstract

American Physical Society, DAMOP Meeting, May 16-19, 2001 London, Ontario, Canada Bulletin of the American Physical Society, Vol

Astronomy and Astrophysics

Astrophysics

Scientific paper

We have measured branching fractions and atomic transition probabilities in TiI for 50 visible and near-IR transitions which connect odd-parity levels lying 25000 cm-1 to 27000 cm-1 above the ground state to low-lying even parity levels. Branching fractions are obtained from the analysis of six hollow cathode emission spectra recorded using the Fourier transform spectrometer at the National Solar Observatory, supplemented in cases susceptible to radiation-trapping problems by conventional emission spectroscopy using a commercial sealed lamp operated at very low discharge current. The absolute scale for normalizing the branching fractions is established using radiative lifetimes from time-resolved laser-induced fluorescence measurements.(S. Salih and J.E. Lawler, Astronomy and Astrophysics 239, 407 (1990).) Uncertainties of the transition probabilities range from ±5% for the stronger branches to ±20% for the weaker ones. Among the 16 lines for which previously-measured transition probabilities are listed in the NIST critical compilation,(G. A. Martin, J. R. Fuhr, and W. L. Wiese, J. Phys. Chem. Ref. Data 17, Suppl. 3, 85 (1988).) several significant discrepancies are noted.

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