Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...523..734f&link_type=abstract
The Astrophysical Journal, Volume 523, Issue 2, pp. 734-738.
Astronomy and Astrophysics
Astronomy
33
Atomic Data, Ism: Abundances, Methods: Laboratory
Scientific paper
Radiative lifetimes, measured using time-resolved laser-induced fluorescence, are reported for 18 odd-parity levels of Ni^+. The radiative lifetimes are combined with Ni II emission branching fractions to produce 59 accurate (typically +/-10%) absolute atomic transition probabilities in the ultraviolet (UV) and vacuum ultraviolet (VUV). The UV and VUV branching fractions are determined using a combination of measurements from a Fourier transform spectrometer at the University of Lund and a 3 m focal length vacuum echelle spectrometer system at the University of Wisconsin. Accurate f-values for Ni II resonance lines are important for analysis of spectra on the diffuse interstellar medium (ISM) at low redshift and for studies of the same lines in high-redshift QSO absorption line systems. Resonance lines at vacuum wavelengths of 170.960, 174.155, and 175.191 nm have loggf values of -0.68, -0.60, and -0.80, respectively. Until additional laboratory measurements are completed, we recommend that f-values for other Ni II resonance lines be taken from the relative f-values from Zsargó & Federman with a multiplicative scaling factor of 0.534 (+/-10%). The present measurements indicate that nickel is less depleted in the ISM than previously estimated.
Fedchak J. A.
Lawler James E.
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