Accession Number : AD0783338

Title :   Fundamental Molecular Vibrations from 400 to 50/cm.

Descriptive Note : Final scientific rept. 1 Feb 66-30 Oct 69,


Personal Author(s) : Zerbi,Giuseppe

Report Date : NOV 1969

Pagination or Media Count : 136

Abstract : The results of an extensive investigation of the vibrational spectra in the low frequency region are presented and discussed. Two main lines have been explored: (a) Far infrared spectroscopy has been applied to structure determination of manganese pentacarbonyl halides, of iridium dodecacarbonyl and of the tetravinyl derivatives of Si, Ge, Sn and Pb. Moreover the vibro-rotational Coriolis coupling coefficients and their influence on the thermodynamic properties and on the band shapes have been studied for cyanopropyne. (b) The low frequency lattice fundamentals of chain-like molecules have been investigated. In the case of systems containing hydrogen bonds (HF and HCOOH) dispersion curves and density of the states throughout the first Brillouin zone have been calculated and the propagation of phonons through this kind of crystals has been determined. (Author)

Descriptors :   *Infrared spectra, *Vibrational spectra, *Raman spectra, Nitriles, Alkynes, Spectrum analysis, Far infrared radiation, Metal carbonyls, Metal complexes, Molecular vibration, Polymers, Acetal resins, Chemical bonds, Molecular structure, Silicon compounds, Germanium compounds, Tin compounds, Lead compounds, Transition metal compounds, Phonons, Hydrogen fluoride, Formic acid, Crystals, Italy

Subject Categories : Polymer Chemistry
      Atomic and Molecular Physics and Spectroscopy
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE