Accession Number : AD0476656


Title :   INFRARED REFLECTION STUDIES OF SINGLE CRYSTAL LITHIUM HYDRIDE AND ON ITS ISOTOPIC DERIVATIVE.


Descriptive Note : Technical rept.,


Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA DEPT OF PHYSICS


Personal Author(s) : Brodsky, M H ; Burstein, E


Report Date : Nov 1965


Pagination or Media Count : 136


Abstract : The room temperature infrared reflection spectra of lithium hydride, lithium deuteride, lithium -6 hydride, and lithium-7 hydride have been measured A Kramers-Kronig analysis was then used to determine the frequency dependence of the lattice dielectric constants, and thereby to obtain the long wavelength transverse optical (TO) and longitudinal optical (LO) lattice vibration frequencies. Within experimental error, the observed TO and LO frequencies of 'isotopic compounds' are found to be inversely proportional to the square roots of the reduced masses of the ion pairs. The data were used to derive the Szigeti effective charges for each of the compounds. The observed effective charges are discussed in terms of the shell model representation of the vibrating ions. (Author)


Descriptors :   *INFRARED SPECTRA , LITHIUM COMPOUNDS , INFRARED SPECTROSCOPY , REFLECTION , CRYSTAL LATTICES , VIBRATION , ELECTROMAGNETIC RADIATION , HYDRIDES , ISOTOPES , IONIZATION , PHONONS , GROUPS(MATHEMATICS) , MATHEMATICAL ANALYSIS , COMPUTER PROGRAMMING , INFRARED RESEARCH , DIELECTRIC PROPERTIES


Subject Categories : Inorganic Chemistry
      Crystallography
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE