Accession Number : AD0620623


Title :   INFRARED LATTICE VIBRATIONS OF MAGNESIUM STANNIDE.


Descriptive Note : Physical sciences research papers,


Corporate Author : AIR FORCE CAMBRIDGE RESEARCH LABS L G HANSCOM FIELD MASS


Personal Author(s) : Kahan,A. ; Lipson,H. G. ; Loewenstein,E. V.


Report Date : 1965


Pagination or Media Count : 15


Abstract : The room-temperature infrared reflection spectrum of semiconducting Mg2Sn with carrier concentration of 3 X 10 to the 17th power 1/cc has been measured between the wavelengths of 5 and 100 microns. By classical oscillator theory, the reflectivity of the fundamental lattice vibration region has been analyzed, and the following obtained: frequencies, strengths, and linewidths of the infrared active modes; high and low frequency dielectric constant values; and the refractive index n and extinction coefficient k as a function of wavelength. In order to fit the experimental results, it is necessary to assume two sets of dispersion parameters with the strong transverse optical (TO) resonance at 53.75 microns (186 1/cm) and a weak one at 48.25 microns (207 1/cm). (Author)


Descriptors :   (*CRYSTAL LATTICES, VIBRATION), (*INFRARED SPECTROSCOPY, SEMICONDUCTORS), (*TIN COMPOUNDS, MAGNESIUM COMPOUNDS), REFLECTION, REFRACTIVE INDEX, DIELECTRIC PROPERTIES


Distribution Statement : APPROVED FOR PUBLIC RELEASE