SOLID STATE PROPERTIES OF NON-CONDUCTING MATERIALS OF SIMPLE MONATOMIC AND DIATOMIC SPECIES
BATTELLE MEMORIAL INST COLUMBUS OHIO
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Research is being conducted on the stability of crystal structure of the heavy rare gas atoms, particularly the effect of many-body forces. Analysis into the crystal field in solid argon is made to test the hypothesis that the diatomic term in the exchange expansion causes 2 neighboring atoms in the crystal to behave like a diatomic molecule and that the diatomic unit possesses a permanent quadrupole moment comparable in size to nitrogen quantitative conclusions were not possible concerning this calculation. Analysis with different angle-dependent potentials is made concerning the types of manybody effect required to render the face-centeredcubic structure more stable than the hexagonal close-packed lattice. The 3-body forces between rare gas atoms which occur in the first order of perturbation theory are discussed. Three triangular configurations are considered an equilateral triangle, a 120 degree configuration, and a linear symmetric array. Preliminary results indicate that for an equilateral triangle the interactions are less repulsive than calculated on the basis of 3 isolated pairs whereas for the linear array they are more repulsive. Texts are reproduced of lectures on 1 Validity of the assumption of 2-body forces in molecular physics, Oct. 20, 1960, and 2 On the validity of crystal structures of the rare gases.