This atlas consists of one long data file covering the wavelength region from 3005Å to 10598Å. Most of the data (3,262Å - 10,598Å) was extracted from a series of echelle spectra obtained with the Kitt Peak National Observatory 2.1m coude spectrograph in echelle/grism mode at a resolution (lambda/dlambda) of approximately 75,000. The region from 3005Å to 3262Å was below the useful range of the grism cross dispersers and was obtained with the "A" grating in third order at a resolution of 12,000. The light source was a Westinghouse Corporation hollow cathode lamp, model WL-23418 with a quartz output window. The Ford 3k x 1k CCD F3KB was used as the detector. The data were calibrated, extracted, and dispersion corrected using standard IRAF software. No attempt was made to establish an absolute intensity scale over the whole range of wavelengths, but the echelle blaze function is largely removed on a local intra-order level. A line list is also available with identifications from Palmer and Engleman (1983) for Th and from Norlén (1973) for Ar.
After selecting a wavelength range, click on the 'Get Spectrum' button. After several seconds, a plot and line list will appear. The user has the option of displaying the plot, the line list, or both. There is also a downloading section where the unlabeled FITS data and the plot in Postscript format is available. The plot and line list is created from the IRAF task identify. A list of all the lines shown here may also be found in the IRAF noaolib$linelists directory.
This main page also makes available the entire Atlas and Line List to be downloaded directly. (use Right Mouse Button to Save to Disk)
Palmer, B.A. and Engleman, R., Jr., 1983, Atlas of the Thorium Spectrum, Los Alamos National Laboratory, Los Alamos, New Mexico
Norlén, G., 1973, Physica Scripta, 8, 249.