A calculation is presented on the evolution of longitudinal and transv
erse optical phonons as a function of the concentration parameter x in
the system Zn, Cd1-xSe. The calculation is based in an isodisplacemen
t model of the atoms which include interactions to first and second ne
ighbors. The model is fitted to Raman measurements carried out on thin
-film samples grown by Close Spaced Vapor Transport (CSVT). Comparison
to the experimental data allows to conclude that the x-dependence of
these optical modes corresponds to an intermediate-mode behavior. Copy
right (C) 1996 Elsevier Science Ltd