Analysis of Cold Neutron Spectra of Metals.
Final rept. 15 Sep 69-14 Mar 71,
RECON INC TALLAHASSEE FLA
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A recently developed method for obtaining the absorbed energy spectrum, and calculating its absorption frequencies from elastic constants data, has been applied to metals, using cold neutron spectra in absence of infrared data. The emitted spectrum from incoherent neutron scattering becomes, through Kirchhoffs law, directly related to the absorbed energy spectrum. The cold neutron spectra examined here are for the metals Al, V, Ni, Pd, and Pb. The numerical data of the T- and L-modes are compared with those calculated from elastic constants data, including their interpretations. The agreement is within experimental error. Interesting differences occur between metals and dielectrics with respect to the intensity of the various T-modes. The damping of lattice vibrations in metals is of the same order of magnitude as in dielectrics with ionic binding, i.e., much higher than the damping in dielectrics with covalent binding. Author
- Solid State Physics