NOAO
Daryl W Willmarth
Michael Fitzpatrick
National Optical Astronomy Observatories
950 N Cherry Avenue
P.O. Box 26732
Tucson, AZ 85726-6732

These spectra were obtained with the KPNO 2.1 m coude spectrograph, camera number 5 and grating BL181 from the 4m RC spectrograph. This combination gives a dispersion of 0.35Å per pixel in second order (3300Å - 5000Å), and 0.69Å per pixel in first order (5500Å - 11,100Å). The 1024 x 1024 CCD T1KA was used to obtain the spectra.

Identifications are given for mostly unblended lines but different resolutions will yield varying degrees of blending. For critical work, the references listed below should be consulted. Initial identifications were found in Striganov and Sventitskii (1968), with final wavelengths for argon from Norlén (1973), neon from Crosswhite (1975), and helium from Striganov and Sventitskii (1968). Dispersion solutions were fit to the spectra with the IRAF identify routine using Legendre polynomials of order 3 - 5. The rms fit was typically about 0.01Å. There are some lines which appear sharp and unblended, but are actually close blends of a few tenths angstrom separation. These have not been labeled on the plots. A list of all the lines shown here may be found in the IRAF noaolib$linelists directory.

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.

This main page also makes available the entire Atlas and Line List to be downloaded directly. (use Right Mouse Button to Save to Disk)


Choose a Wavelength Range and Display Options
(3300Å to 11100Å, no commas please)
Start Wavelength: End Wavelength:
Max Num Lines: Show Plot Show List


References
Crosswhite, H. M. 1975, Journal of Research of the National Bureau of Standards - A, 79A, 17.
Norlén, G. 1973, Physica Scripta, 8, 249.
Striganov, A. R. and Sventitskii, N.S. 1968, Tables of Spectral Lines of Neutral and Ionized Atoms, Plenum Data Corporation, New York, N.Y.