Vibrational Studies of the Structure of Disordered Solids.
Final rept. 15 Jul 80-14 Mar 84,
XEROX PALO ALTO RESEARCH CENTER CA
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The goal of this program was to further improve our understanding of the vibrational excitations of disordered solids, and to use this knowledge to elucidate the structure of glasses and amorphous thin films. Much significant progress has been made, utilizing Raman, infrared and inelastic neutron scattering experiments, supplemented by novel theoretical work on central force network models and dihedral angle averaged Bethe lattices. Particularly important were the discovery of regular rings of bonds as dominant defects in the otherwise disordered structure of amorphous Si02, and the unveiling of simple Raman selection rules for amorphous networks. Twenty two scientific papers have been published, and several more are in the process of completion.