Universität Wien

Optical and Infrared Spectroscopy

Interaction of electromagnetic radiation with quasiparticles in solids:

Optical spectroscopy (UV-vis): 1.6 eV – 5 eV

Infrared spectroscopy (IR, far IR): 0.1 eV to 1.6 eV

Relevant quasiparticles are (polar) phonons for IR spectroscopy and electronic excitations for IR and UV-vis spectroscopy

Standard experimental techniques are absorption (transmission), reflection, or reflection absorption

Recordings using Fourier techniques enhance the sensitivity of the experiments
This type of spectroscopy is described by linear response functions such as: n(w), epsilon(w), xi(w), sigma(w), alpha(w). These functions are subjected to Kramers-Kronig relations. Evaluation of the functions needs first order perturbation theory

Special Techniques

Special techniques have been developed in order to increase information from UV-vis and IR spectroscopy. Examples are:
Fourier IR- Microspectroscopy
Time resolved spectroscopy
Attanuated total reflection spectroscopy

Equipment Available

Fourier Transform Infrared spectrometer: Bruker 66v
for spectral range from 5 meV to 0.6 eV
Hitachi UV-vis spectrometer: U 3410
For spectral range from 0.5 eV to 5 eV