Optical spectroscopy at colour centres and molecules
Supervisor: Dr. Volker Riede
The common physical property of colour
centers and the iodine molecule (which will be investigated in this
experiment) is the interaction between electronic transitions and
vibrations of the atoms. Therefore the Franck-Condon principle holds
for both. The position of the absorption maxima of the measured iodine
vapour spectrum have to be determined, and from that the convergence
energy, the dissociation energy, and the energy of the electronic
transition are to be estimated. The colour centers are generated in
NaCl-,KCl-, and KBr-crystals by UV- radiation or X-rays. The absorption
spectra provide the concentration of the centers in dependence on time,
the energy of the electronic transition and the line width. The results
have to be compared to values calculated with a classical and a quantum
mechanical model.
- Generation of colour centers
- Determination of energetic position and of concentration of the centers
- Calculations within the classical and quantum mechanical model
- Morse potential
- Energy schemes of molecules
- Franck-Condon principle
- Experimental determination of the characteristic energies
- Optical spectroscopy in the range of visible light, resolving power
- Calculation of the absorption coefficient
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