Comparing nature of low frequency vibration of AsnSm nanoclusters in bulk glasses and clusters incorporated in dielectric matrixes

The position of calculated low frequency (LF) modes of i-member rings decreases with increasing cluster sizes. They are torsional and out of plane bending vibrations involving group of atoms and even extend to 3-5 bonds. The atomic motions for some of these vibrations have a “wave-like” character. Torsional LF vibration also have free elastic sphere oscillations transposed earlier to free or embedded nanoparticles acoustic modes.