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A quantum corresponding to a vibrational excitation of random fractal structure, which is localized in space.
A vibrational quantum of a fractal structure, either random or ordered, that may be localized or delocalized.
A quantum of a localized vibrational excitation of a disordered structure, whether or not it is fractal.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.