133 research outputs found
Structure and lattice dynamics of dipolarly disordered 2,3-dimethylanthracene crystals
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Distribution of component molecules in p-dibromobenzene-p-dichlorobenzene solid solutions from raman effect data
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Triptycene End‐Capped Quinoxalinophenanthrophenazines (QPPs): Influence of Substituents and Conditions on Aggregation in the Solid State
No full textLattice distortion of quantum cryocrystals under pressure
No full textThe hcp lattice distortion parameter δ, the deviation of c/a ratio from the ideal hcp value √ 8/3 , have been calculated for solid He under pressure taking into account two- and three-body interatomic forces. The resulting lattice distortion parameter is small and negative, that is the lattice is slightly flattened compared with the ideal hcp lattice. It monotonically increases in absolute value with pressure and reaches 10⁻³ for molar volume of ~ 2.5 cm³/mol. Such small distrotions are most likely outside of possibilities of x-ray or neutron experiments but can be detected by optical methods based on measurements of the birefringence. The data on δ can be used as a probe of the many-body forces
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