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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 50,
  • Issue 6,
  • pp. 759-763
  • (1996)

TO-LO Splitting in Infrared Spectra of Thin Films

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Abstract

The importance of transverse optic-longitudinal optic (TO-LO) splitting in the interpretation of infrared spectra of thin films is experimentally presented. When infrared spectra are observed at oblique angles of incidence, the shifts in peak position and/or the changes in peak shape may be due to TO-LO splitting. Before one assigns the optical behavior to surface phenomena such as molecular orientation, proper care must be employed. The proposed technique includes optical calculation to extract surface phenomena from TO-LO splitting in the spectra, and it is applied to reflection absorption spectra of perfluoropolyether.

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