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Proceedings Paper

Advances In FT-IR Mixture Searching
Author(s): Daniel T. Sparks; Arthur Schlieper; John Peterman
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Paper Abstract

A popular method for identifying an unknown substance is to mathematically compare its infrared spectrum with a library of reference infrared spectra. The spectra of the best matches are then visually compared with the unknown spectrum in an attempt to discern the identity of the unknown substance. The assumption here is that when a reference spectrum for the unknown is contained in the library, that spectrum will appear as one of the top "hits" in the search. There are numerous factors, however, which can invalidate this assumption. Impurities at relatively high concentration levels can cause many problems including peak shifts due to chemical interactions, spurious peaks arising from isolated impurity absorbances, and shifts in relative peak heights due to impurity bands which coincide with the substance of interest.

Paper Details

Date Published: 1 December 1989
PDF: 1 pages
Proc. SPIE 1145, 7th Intl Conf on Fourier Transform Spectroscopy, (1 December 1989); doi: 10.1117/12.969410
Show Author Affiliations
Daniel T. Sparks, Nicolet Instrument Corporation (United States)
Arthur Schlieper, Nicolet Instrument Corporation (United States)
John Peterman, Nicolet Instrument Corporation (United States)


Published in SPIE Proceedings Vol. 1145:
7th Intl Conf on Fourier Transform Spectroscopy

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