# Fourier-Transform-Infrared-Spectroscopy on Solids

Supervisor: Dr. Volker Riede

The Fourier-Transform Spectroscopy is a fundamental spectroscopic
method. The measurement method of this experiment is introduced with
the help of investigations in the infrared spectral region. The most
important component of the infrared spectrometer is the Michelson
Interferometer.

Using specific measurements the mathematical basics and the measuring
method of the Fourier-Transform-Infrared (FTIR) Spectroscopy are
investigated, e.g. the connection between the intensity spectrum and
the interferogram as well as the dependence of the resolving power on
the optical path.

With the aid of these findings the local lattice modes of oxygen in
Si:O and of nitrogen in GaNAs are investigated and calculated using a
simple theoretical model.

As an additional task the reflectivity of a GaNAs sample is to be determined by experiment and by calculations.

- Basics of Fourier transformation and FTIR spectroscopy
- Dielectric function, optical constants and lattice vibrations
- Experimental determination and calculation of the frequencies of local lattice modes

The FTIR spectrometer IFS 48 used in this experiment is a perpetual loan of the Bruker Optik GmbH.

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