Abstract
A description of the librational molecular motions in solid α-N2 in terms of spherical harmonics is applied to give a temperature-dependent molecular field theory. Electrostatic quadrupole-quadrupole interactions between molecules on a fcc lattice with space groupPa3 are assumed. A first-order transition from a phase where the molecules are librating to one where they are rotating freely is found. In addition, the librational frequencies at κ=0 and zero temperature are calculated, using the single-particle states of the molecular field theory, and compared with Raman scattering experiments.
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Supported by NSF Grant No. 22553; work performed in part under the auspices of the U.S. Atomic Energy Commission.
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Raich, J.C., Etters, R.D. Librational motion in solid α-N2 . J Low Temp Phys 7, 449–458 (1972). https://doi.org/10.1007/BF00628256
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DOI: https://doi.org/10.1007/BF00628256