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Phonon modes found in low frequency Raman scattering from $CdS_{1-x}Se_x$nanocrystals embedded in borosilicate glass arising from confined acousticphonons are investigated. In addition to the breathing modes and quadrupolarmodes, two additional modes are found in the spectra. In order to assign thenew modes, confined acoustic phonon frequencies are calculated using CFM, CSMand the Lamb model. Based on the ratio of the frequencies of the new modes tothose of the quadrupolar mode, the new modes are assigned to first overtone ofthe quadrupolar mode (l=2, n=1) and l=1, n=0 torsional mode. The appearance ofthe forbidden torsional mode is attributed to nonspherical appearance shape ofthe nanoparticle found from high-resolution TEM.

Low Frequency Raman Scattering from Acoustic Phonon Confined in $CdS_{1-x}Se_x$ Nanoparticles in Borosilicate Glass