Experimental Study of Unusual IR and Far IR Vibrational Energy Transfer Processes in Solids.
Abstract
Seven different experimental studies are described. (a) Hole burning in chalcogenide glasses: The dephasing time is a function of the average coordination number of the glass and is independent of the chemical composition. (b) Vibrational relaxation of diatomic molecules in alkali halide crystals: The matrix isolated CN- molecule obeys an energy gap law while the hydride molecule does not. (c) Vibrational relaxation of diatomic molecules in glass: Our IR pump - probe examination of SH in As2S3 glass has show that this impurity molecule is actually weakly hydrogen bonded in the glassy structure. (d) Pocket vibrational modes in crystals: A systematic study of a point defect in a crystal lattice has demonstrated that there are localized modes with the maximum mode amplitude at sites far removed from the defect itself. (e) Intrinsic localized vibrational modes in perfect crystals: The inclusion of both cubic and quartic terms in the potential has produced not only localized vibrational modes but also a localized dc expansion at the mode site. (f) Extinction sum rules for particles of arbitrary size: We have uncovered a general extinction sum rule which is independent of the size of the particle in relation to the wavelength and independent of the composite nature of the particle. (g) Measurement of a charged particle bunch from the coherent transition radiation mm-wave spectrum: The coherent far infrared radiation induced from relativistic electron bunches submillimeter length provides a new way to characterize the electron bunch shape.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 31, 1996
- Accession Number
- ADA308323
Entities
People
- A. J. Sievers
Organizations
- Cornell Laboratory of Atomic and Solid State Physics