Accession Number : ADP008230

Title :   Time Dependent Hole Burning and Optical Coherence Experiments as Probes of Spectral Diffusion in Low Temperature Glasses,

Corporate Author : STANFORD UNIV CA DEPT OF CHEMISTRY

Personal Author(s) : Fayer, Michael D.

Report Date : 22 MAY 1992

Pagination or Media Count : 4

Abstract : Dynamics and interactions in low temperature glasses can be studied with optical line narrowing techniques applied to chromophores embedded in glassy hosts. Prior to the use of optical methods, a wide variety of classical methods, such as heat capacities, were applied to the study of glasses. Results have been, successfully interpreted in terms of a model of. the glass potential surface described in terms of Two Level Systems (TLS). Because of the very large extent of inhomogeneous broadening in glassy systems, it is necessary to apply line narrowing methods to provide information on the dynamics and interactions of atoms and molecules with their environments. A number of optical line narrowing methods have been developed to remove inhomogeneous broadening. Among these are hole burning, fluorescence line-narrowing, accumulated grating echoes, stimulated photon echoes, and photon echoes. The photon echo and the stimulated photon echo are the direct optical analogs of the magnetic resonance spin echo and stimulated spin echo.

Descriptors :   *GLASS, *OPTICAL PROPERTIES, *LINE SPECTRA, ANALOGS, ATOMS, CHROMOPHORES, DYNAMICS, ECHOES, FLUORESCENCE, HEAT, INTERACTIONS, LOW TEMPERATURE, MAGNETIC RESONANCE, MODELS, MOLECULES, PHOTONS, RESONANCE, SURFACES, TEMPERATURE, OPTICAL MATERIALS, FREQUENCY, MOLECULAR SPECTROSCOPY.

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE