INFRARED SPECTROSCOPY

 

Teaching by: Panos Papagiannakopoulos, Yannis Lazarou, Stratos Kamitsos, George Chryssikos and Constantine Varotsis

Outline:

  • Introduction (the electromagnetic spectrum, far-mid- and near infrared). Harmonic oscillator, diatomic molecules.
  • Group theory and vibrational spectroscopy, normal modes, point groups, crystal field effects - selection rules. Polarized infrared, dichroism, molecular orientation. Isotope effects, product rule.
  • Kramers-Kronig analysis of reflectivity data.
  • Fourier transform infrared spectroscopy. Advantages. Components of FTIR spectrometers.
  • Infrared data acquisition techniques for solids liquids and gases. Transmission. Specular reflection. Diffuse reflection, Kubelka Munk tranform. Transflection. ATR, penetration depth, variable angle Photoacoustic spectroscopy. Infrared microscopy.
  • Semiempirical infrared band assignment. Oscillation of characteristic groups.
  • Near infrared spectrosopy. Chemometrics.
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    Lab - Applications

    1. Getting familiar with an FTIR spectrometer. Infrared by transmission (KBr pellets, films)
    2. Diffuse reflectance. Spectra of powdered samples.
    3. Specular reflectance in the 30-4500 cm-1 range. Far-infrared.
    4. Infrared by transflection. Characterization of packaging materials.
    5. ATR. Characterization of multilayer films
    6. Near infrared. Identification and characterization techniques (chemometrics)

    Laboratory Training