A comparison of the long wave optical phonons in trigonal Se and trigonal Te

Abstract

The frequencies of the long wave optical phonons in trigonal Se and Te are compared. Differences in the relative frequencies of the A₁ and A₂ modes, and in several of the elastic constants as well, are attributed to differences in the intra‐ and inter‐chain bonding. These comparisons are made quantitative by defining reduced lattice dynamical properties in which the nearest and second nearest neighbor distances are used as scaling parameters respectively for the intra‐ and inter‐chain properties. The comparison is extended to the optic mode frequencies of amorphous Se and Te.