Computer Science – Databases
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1058..273g&link_type=abstract
SPECTRAL LINE SHAPES: Volume 15-19th International Conference on Spectral Line Shapes. AIP Conference Proceedings, Volume 1058,
Computer Science
Databases
4
Line Shapes, Widths, And Shifts, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc., Zeeman And Stark Effects
Scientific paper
Described by simple atomic theory published in 1913 by Niels Bohr, spectral lines in the radio range arising from transitions between large principal quantum numbers of atoms have proved to be useful tools for astronomers and physicists. Called ``radio recombination lines'' because of the wavelength range where most are observed, they are usually easy to detect, give unique information about astronomical objects, and facilitate the study of physical effects in environments that cannot be created in terrestrial laboratories. Observations have revealed unexpected results regarding thermodynamic populations of the principal quantum levels and about pressure broadening in astronomical environments. Detections of large-n lines, such as the n = 1006-->1010 absorption line of interstellar carbon, show the existence of atoms with classical diameters of about 0.1 mm, the thickness of a sheet of typing paper. This paper briefly discusses observations of Stark broadening reported by Bell et al. in 2002.
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