Accession Number : AD0671194

Title :   INFRARED SPECTRA OF VITREOUS GERMANIUM DIOXIDE.

Descriptive Note : Technical rept.,

Corporate Author : ROCHESTER UNIV N Y DEPT OF CHEMICAL ENGINEERING

Personal Author(s) : Su,Gouq-Jen ; Chen,Benjamin T-K.

Report Date : 15 MAY 1968

Pagination or Media Count : 50

Abstract : The infrared absorption and reflection spectra of vitreous germanium dioxide were measured in the frequency region 4,000 to 80/cm. A short range order that can characterize the vitreous GeO2 network is derived from the x-ray work of Nelson, Siegel and Wagner and Smith and Isaacs. A vibrational analysis involving the calculation of the vibrational frequencies of the normal modes of the average structural unit was carried out using the Wilson FG-Matrix technique and a group theoretical method. Three force constants were obtained and the sixteen corresponding frequencies so calculated are compared with the measured spectra. The calculated frequencies and the force constants used are presented in the following table. In spite of the approximate nature of the structural unit and calculations, the agreement between the observed and calculated frequencies is very good. Force constants, in dynes/cm are: Ge-O bond stretching force constant k sub r = 395,000; O-Ge-O angle bending force constant k sub alpha = 17,000; Ge-O-Ge angle bending force constant k sub beta = 2,400. (Author)

Descriptors :   (*GERMANIUM COMPOUNDS, INFRARED SPECTRA), (*DIOXIDES, INFRARED SPECTRA), FREQUENCY, VIBRATION, MATRICES(MATHEMATICS), FORCE(MECHANICS), BENDING, GLASS

Subject Categories : Ceramics, Refractories and Glass
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE