Physics – Plasma Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..771..152l&link_type=abstract
ATOMIC AND MOLECULAR DATA AND THEIR APPLICATIONS: Joint Meeting of 14th Internat. Toki Conf. on Plasma Physics and Controlled Nu
Physics
Plasma Physics
Atomic Spectra, Atomic And Molecular Data, Spectra, And Spectral Parameters, Chemical Composition And Chemical Evolution, Galactic Halo
Scientific paper
The spectra of neutral and ionized rare earth elements have been receiving renewed attention from laboratory spectroscopists during recent years. These efforts have been motivated by data needs of the astrophysics and lighting research communities. In astrophysics studies of metal-poor Galactic halo stars are providing a deeper understanding of the origins of heavy elements, of the chemical evolution of the Galaxy, and some insights into the rapid and slow neutron-capture mechanisms. Rare earth elements are widely used in Metal Halide High Intensity Discharge lamps. The superior performance of such lamps has motivated further development of these devices. Basic spectroscopic data are needed for modeling and diagnosing new lamp designs. This paper reviews progress on determining atomic transition probabilities for neutral and singly ionized rare elements. The most widely used experimental method involves combining radiative lifetimes from laser induced fluorescence measurements, with emission branching fractions from Fourier transform spectra. Theoretical methods for determining atomic transition probabilities have also been improved in recent years. Progress on hyperfine structure and isotopic data is also discussed in this paper.
Den Hartog Elizabeth A.
Lawler James E.
Sneden Chistopher
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