Infrared reflection from longitudinal modes in anisotropic crystals

In anisotropic crystals belonging to the tetragonal, hexagonal, trigonal, and orthorhombic systems it is often found that naturally occurring faces are normal to the transition dipole direction for vibrational modes which are reasonably well separated in the spectrum. Strong reflectivity from such f...

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Bibliographic Details
Published in:The Journal of chemical physics 1973-05, Vol.58 (10), p.4056-4060
Main Authors: Decius, J. C., Frech, Roger, Brüesch, Peter
Format: Article
Language:English
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Summary:In anisotropic crystals belonging to the tetragonal, hexagonal, trigonal, and orthorhombic systems it is often found that naturally occurring faces are normal to the transition dipole direction for vibrational modes which are reasonably well separated in the spectrum. Strong reflectivity from such faces of waves with transverse magnetic polarization at finite incidence angles is found at frequencies above that of the longitudinal mode. Experimental data for this configuration are presented for the ν2 and ν3 carbonate vibrations in calcite. Theoretical curves are calculated as a function of incidence angle and damping constant, and the special utility of this type of experiment is discussed.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1678960