Accession Number:

AD0626595

Title:

OPTICAL VIBRATION SPECTRA OF SOLIDS.

Descriptive Note:

Final rept. 14 Jan 63-13 May 65,

Corporate Author:

IIT RESEARCH INST CHICAGO ILL

Personal Author(s):

Report Date:

1965-08-03

Pagination or Media Count:

232.0

Abstract:

The infrared reflection andor transmission spectra of CdS, ZnS, ZnO, BN, NiO, CoO, and their mixed crystals, MnO, Al2O3, MgOH2 and Cu2S are reported at one or more temperatures. The Raman spectrum of ZnO is also reported. The experimental investigations also included the study of crystal field spectra of Ni2, Co2 and Mn2 in their respective monoxides. The infrared and the ultraviolet absorption by U-centers in alkali halides was studied and interpreted in terms of localized virational modes of the impurity centers. Theoretical investigations include discussions on i The trends in the characteristic phonon frequencies of the II-VI compounds, ii the assignment of the multiphonon infrared absorption in GaAs using the space group selection rules, iii the validity of the LyddaneSachs-Teller relationship at long wavelengths, iv the combination of the lattice modes with the internal modes in a crystal containing polyatomic groups, and v the Gruneisen parameter for long wavelength optical modes in ionic crystals. Author

Subject Categories:

  • Atomic and Molecular Physics and Spectroscopy
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE