Measurements of hyperfine structure in TaII

Details Measurements of hyperfine structure in TaII Measurements of hyperfine structure in TaII

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002mnras.334...48z&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 334, Issue 1, pp. 48-52.

Astronomy and Astrophysics

Astronomy

4

Atomic Data, Line: Profiles, Atomic Data, Line: Profiles

Scientific paper

We report the first extensive measurements of hyperfine structure in TaII. Spectra of TaII were recorded by high-resolution Fourier transform spectrometry in the region 10000-53000cm-1(1886-10000Å) and the majority of observed lines show significant hyperfine structure. Computer fits to several hundred of these line profiles have yielded values of the magnetic dipole hyperfine interaction constant A for 88 energy levels with an uncertainty of between 0.5 and 10 per cent for the majority of A factors. The A factors range from -0.078 to +0.065cm-1 for the even levels and from -0.064 to +0.083cm-1 for the odd levels. For the majority of these A factors no previous measurements are known. Approximate values of the electric quadrupole hyperfine interaction constant B were found for 73 levels. These measurements of A and B factors allow, for the first time, the effects of hyperfine structure in TaII lines to be correctly accounted for both in abundance analysis and in the resolution of blended lines in astrophysical spectra.

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