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Phonon density of states measured by inelastic nuclear resonant scattering.

The phonon density of states was measured by observing the nuclear resonant fluorescence of {sup 57}Fe versus the energy of incident x rays from a synchrotron radiation beam. An energy resolution of 6 meV was achieved by use of high-resolution crystal optics for the incident beam. Extremely low background levels were obtained via time discrimination of the nuclear fluorescent radiation.