Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apri16012w&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
The hyperfine structure of the 13D excited state of NaK was analyzed, using spectroscopic data collected by Prof. Huennekens’ group at Lehigh University. A Hamiltonian matrix was constructed that included terms for rotational energy, centrifugal distortion, spin-orbit, spin-spin, and spin-rotation energy. Constants describing the rotational energy levels have been determined previously by Prof. Huenenkens’ group. In the present work a least squares fitting program was used to determine values of the spin-orbit constants Av and the constant b for the Fermi contact term in the nuclear spin interaction that best fit about 1200 experimentally measured energy levels. Additional fits were examined to estimate upper bounds for the spin-spin and spin rotation contributions. The analysis shows that the data illustrate a transition between Hund’s angular momentum coupling cases bbJ and bbS. Low values of the rotational quantum number N ( 15) correspond to bbJ, and higher values N ( 45) approach the bbS case.
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