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.
Lab - Applications
- Getting familiar with an FTIR spectrometer. Infrared by transmission (KBr pellets, films)
- Diffuse reflectance. Spectra of powdered samples.
- Specular reflectance in the 30-4500 cm-1 range. Far-infrared.
- Infrared by transflection. Characterization of packaging materials.
- ATR. Characterization of multilayer films
- Near infrared. Identification and characterization techniques (chemometrics)
Laboratory Training
- Perform IR multiphoton excitation of polyatomic molecules in the gas phase with a CO2 laser
- Study the IR multiphoton decomposition of molecules in the gas phase as a function of several factors with a CO2 laser
- Study the inverse electronic relaxation (IVR) process in vibrationally overexcited molecules in a CO2 laser photolysis
- Perform synthesis of new material in the gas phase by IRMPE of polyatomic molecules with a a CO2 laser.