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Infrared Spectroscopy
Nicolet 380 FTIR
(2006)
The amount of energy a molecule contains is not continuously variable but
quantized. This means that a molecule can stretch, bend, or rotate only at
specific frequencies. For example, a typical C-H bond has an average bond
length of 1.10 Angstroms. This length is only an average - vibrating back
and forth due to stretching, bending, and rotation (both symmetrically and
asymmetrically) are all happening on a moment by moment basis. When the
molecule is irradiated with electromagnetic radiation, the vibrating bond
will absorb energy if the frequencies of the light and the vibration are the
same. This absorption phenomena is the principle that the IR takes advantage
of in the production of spectra that can be easily interpreted by the
trained chemist.
The IR is a popular tool used by inorganic, organic, and physical chemists
due to the variety of information that it conveys in a fast amount of time.
The following photograph is an unknown sample and above the graph is
specific regions where the vibrations are characterized.
Contact Information
Dr. Michael Norton
Marshall University Dept. of Chemistry
norton@marshall.edu
304-696-6627
Dr. Gary Anderson
Marshall University Dept. of Chemistry
anderson@marshall.edu
304-696-6594
Dr. Michael Castellani
Marshall University Dept. of Chemistry
castella@marshall.edu
304-696-6486
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