Accession Number : ADA116900

Title :   Raman and X-Ray Investigations of Ice VII to 36.0 GPa.

Descriptive Note : Technical rept.,

Corporate Author : HOWARD UNIV WASHINGTON DC DEPT OF CHEMISTRY

Personal Author(s) : Walrafen,G E ; Abebe,M ; Mauer,F A ; Block,S ; Piermarini,G J

PDF Url : ADA116900

Report Date : 30 Jun 1982

Pagination or Media Count : 34

Abstract : Raman data for ice VII to 30 GPa and x-ray lattice parameters to 36 GPa, all at room temperature, are presented and discussed. Both the Raman OH-stretching peak frequency (delta cap Nu) and the edge distance of the body-centered cubic unit cell (a) decrease at a decreasing rate with pressure rate. The OH peak frequency is found to be virtually linear in the nearest-neighbor 0-0 distance (r00) between about 2.5 and 2.9 A. However, the data can also be fitted with a slight cubic dependence, which when extrapolated, gives rise to a minimum in delta cap Nu at r00 = 2.35 plus or minus 0.06 A. This is close to the value of 2.4 A found for the symmetric O-H-O units in other materials. (Author)

Descriptors :   *Raman spectra, *Scattering, *X rays, *Ice, Peak values, Rates, Frequency, Pressure, Crystal lattices, Extrapolation

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Nuclear Physics & Elementary Particle Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE