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Spectral ranges in IR Spectroscopy . NIR. MIR. FIR. 15.000 cm -1. 4.000 cm -1. 400 cm -1. 5 cm -1. What is IR-spectroscopy?. Interaction of light and matter. Excitation of vibrations. Types of vibrations example: water. stretching vibrations:. deformation vibration.

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spectral ranges in ir spectroscopy
Spectral ranges in IR Spectroscopy

NIR

MIR

FIR

15.000 cm-1

4.000 cm-1

400 cm-1

5 cm-1

what is ir spectroscopy
What is IR-spectroscopy?
  • Interaction of light and matter

Excitation of vibrations

types of vibrations example water
Types of vibrations example: water

stretching vibrations:

deformation vibration

symmetric stretching vibrations

anti symmetric stretching vibrations

principle of nir spectroscopy
Principle of NIR spectroscopy
  • Excitation of vibrations
    • Overtone bands
    • Combination bands
  • Evaluation of OH, CH, NH functional groups
  • Requires comparison against known data (Quantification or qualification models)
spectra of water
Spectra of water

5

MIR

/

NIR

Fundamental stretching

4

3

Extinction

Fundamental bending

Combination

2

1st overtone

1

0

9000

8000

7000

6000

5000

4000

3000

2000

1000

Wavenumber

(cm-1)

nir spectra
NIR Spectra
  • Contain information on the physical form of the material and its chemical structure. Particle size and density difference will be seen as baseline offsets.
  • Contains broad, overlapping absorbance bands from multiple components and/or functional groups
nir evaluation of spectra

Analysis values

Reference values

NIR Evaluation of spectra
  • Requires comparison against known data
    • Qualification:comparison against a set of spectra of known good quality“IDENT methods”
    • Quantification:using spectral information of samples of known concentrations to predict concentrations of new unknown samples. PLS is used for this type of evaluation.