Infrared Spectroscopy
Terry A. Ring
Chemical Engineering
University of Utah
Molecular Vibrations
• Mass on a spring
• Vibration Frequency
• ν=c/λ
• Wave number =1/ λ
Spectrometer
• Single Beam• Dual Beam
– with Reference
• Gas, Liquid & Solid• Sample Cells• Powder mixed with
KCl to make pellet• Reflection off surface
of Sample• Attenuated Total
Reflection
Sample
Sample
Spectrum
• Peak Identification
Spectrum
• Peak Identification– Valence Vibrations– Bending Vibrations
Peak Identification
Fourier Transform IR
• Mixing light from– Fixed mirror – Moving mirror
Raman Spectroscopy• Laser Light
Illumination
• Scattered Light Spectra Observed
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