Lattice Absorption Bands in Indium Antimonide

A series of detailed measurements of the absorption spectrum of high quality single crystals of n-type indium antimonide has been made in the wavelength range 15 to 130 μ, and over the temperature range 4.2 to 90°K. Some new absorption bands have been found, and an explanation is offered for the positions and temperature dependence of all the principle absorption peaks in terms of multiple phonon interactions involving phonons with energies corresponding to temperatures of 259, 224, 169 and 62°K.