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The frequency spectrum of an amorphous Lennard-Jones solid, as determined by molecular-dynamics methods, is entirely different from that of a crystalline solid of the same nature, although its radial distribution function shows the environment of each atom to be similar in both cases. Such a disparity is interpreted in terms of a preponderance of the effects of the local forces (i.e. those between direct neighbours) which, in the case of the amorphous solid, is supposed to take place because of the absence of long-range co-ordination among individual atomic motions. To give the observed spectrum, this feature combines with a structure in which atomic clusters of different radii seem to coexist. |
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