Accession Number : AD0636614

Title :   FAR-INFRARED SPECTRA OF CRYSTALS AND SOLIDS IN A LARGE RANGE OF TEMPERATURES.

Descriptive Note : Final rept., (Scientific).

Corporate Author : CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE PARIS (FRANCE)

Personal Author(s) : Lecomte, J. ; Hadni,A.

Report Date : 31 MAY 1966

Pagination or Media Count : 22

Abstract : Development was undertaken of Far-Infrared techniques at liquid helium temperatures to get absorption and reflection spectra from which are deduced the optical constants of the solids. They appear fruitfull and disclose: (1) the supertransmission of crystals at low temperature in the far-infrared; (2) the different behaviour of crystals and glasses; (3) far infrared electronic transitions in several materials; (4) a drastic change of damping and anharmonicity with temperature. (Author)

Descriptors :   (*INFRARED SPECTROSCOPY, CRYOGENICS), (*CRYSTALS, INFRARED SPECTROSCOPY), CRYSTAL LATTICES, ELECTRON TRANSITIONS, ABSORPTION SPECTRA, REFLECTION, CHEMICAL BONDS, VIBRATION, INSTRUMENTATION, QUARTZ, SILICON COMPOUNDS, DIOXIDES, FRANCE

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE