SciFinder (CAS Registry) has experimental spectra for more than 900,000 compounds and over 80 million predicted proton and 13C NMR spectra. IR, MS and NMR spectra are sourced from the Wiley spectral databases and the SDBS database.
The AEDC/EPA database contains experimental and calculated spectral data of interest to the pollution monitoring and gas diagnostics community. Spectra files are in .spc format, requiring a special viewer such as ShowSPC.
This database provides easy access to a selection of the most important and frequently used atomic spectroscopic data, including data for the neutral and singly-ionized atoms of all elements, hydrogen through einsteinium.