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The various evaluation procedures of IR reflection spectra, viz. Kramer-Kronig analyses (KKA), 3 parameter (coTO, g, y) (3 PM), and 4 parameter (ω ro , ω LO  y ro  y LO ) oscillator-model calculations (4 PM), are compared. For the zone-centre phonon energies, the oscillator parameters ω ro  and ω LO  of 4 PM as well as the frequencies of the dielectric functions ε" and - Im(l/ε), respectively (KKA, 3 PM), are recommended. The pole frequencies of the |ε| functions yield too large TO/LO splittings, especially in the case of large damping of the phonons. In the case of asymmetric reststrahlen bands, the use of 4 PM with different damping constants y for the TO and LO phonons is recommended. Computer simulations of the influence of the various oscillator parameters on the reflection spectra as well as the phonon frequencies of spinel-type MnCr 2 O 4  are included

Lattice Vibration Spectra. LXX. Evaluation of IR Reflection Spectra. Model Calculations and Experimental Data of MnCr 2 O 4 Single Crystals