Data available on atomic spectral tables for the Chandra X-Ray Observatory.

Spectral tables for four cosmically abundant elements (Ne, Mg, Si, and S) in the wavelength region of interest for the Chandra X-Ray Observatory, which is roughly 2 nm to 17 nm, have been critically compiled with partial support from the Chandra Emission Line Project. These data also will be useful for the diagnostics of plasmas encountered in fusion-energy research.

This is the first extensive critical compilation for these spectra. Data for about 3300 spectral lines of 24 ions are tabulated. The compiled wavelengths and energy levels are from experimental sources, while the transition probabilities originate mainly from recent calculations carried out with advanced, multiconfiguration computer codes, with relativistic terms included. Uncertainty estimates for the transition probabilities are also provided.

The data will be published in the Journal of Physical and Chemical Reference Data. They are now available as a database at physics.nist.gov/chandra. The database has a user interface that includes options to retrieve subsets of the data in several different formats.

CONTACT: Larissa Podobedova, [phone]; [e-mail] or Karen Olsen, [phone]; [e-mail].