Far-infrared absorption in cubic ZnS

Far-Infrared Dielectric Function of Zincblende ZnS

The complex dielectric response function of zincblende ZnS is determined a t 300 K by dispersive Fourier transform spectroscopy. The frequency range studied, 150 to 450 cm-l, spans the frequency of the q = 0 transverse optic (TO) phonon mode. The frequency dependence of the anharmonic self-energy function T(Y) of the q = 0 TO phonon is calculated from these data. The features observed in the sp...

Far-infrared Absorption by Small Particles

Detailed far-infrared (FIR) and mid-infrared (MIR) studies of aluminum small particles have been carried out. MIR absorption studies of clustered and non-clustered samples suggest that the anomalous FIR absorption does not arise from the clustering together of the individual metallic particles. The MIR absorption, which is too small to be the continuation of the anomalous FIR absorption, could ...

FAR-INFRARED ABSORPTION DUE TO IMPURITIES IN CsBr CRYSTALS

Far - Infrared Absorption in Amorphous 111 - V Compound Semiconductors

The infrared spectra of amorphous films of Gap, GaAs, GaSb, InAs, and Ge prepared by sputtering have been measured from 10 to 4000 cm-1. The absorption spectra in the region of the “optical” phonon frequencies show similarities to the phonon density of states as deduced from Raman scattering but the absorption becomes much smaller a t low frequencies. It is shown that while the coupling constan...

Far-infrared absorption in parallel quantum wires with weak tunneling.

We study collective and single-particle intersubband excitations in a system of quantum wires coupled via weak tunneling. For an isolated wire with parabolic confinement, the Kohn's theorem guarantees that the absorption spectrum represents a single sharp peak centered at the frequency given by the bare confining potential. We show that the effect of weak tunneling between two parabolic quantum...