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Reference items are located in the Information Commons on the first floor of Fogler Library. If "Ref" is not at the beginning of the call number they will be shelved in the regular book stacks on the 2nd and 3rd floors. More options can be found by searching the URSUS catalog using keywords like spectra atlases, spectroscopy atlases, spectra tables, or spectroscopy tables.
The National Institute of Standards and Technology provides a list of freely available databases some of which are collections of spectral data. Scroll down to "Documentation" to see the relevant databases.
SciFinder-n provides experimental spectra for certain materials. Do a Substance search for your material, then scroll down on the results page until you see the "Experimental Spectra" filter in the left sidebar. Click there to see if they have Spectra available for your substance.
The spectral library includes samples and spectra collected and assembled for the purpose of using spectral features for the remote detection of materials such as:
minerals, rocks, soils, mixtures, plants, vegetation communities, microorganisms, and man-made materials