Abstract
It is shown that a local field effort, i.e. the Lorentz correction Elow- Emean = 1πp/3, in a dense thermal gas of two-level molecules may give rise to a remarkable antiferroelectric structure with zero macroscopic electric field, Emean = 0. This is a stationary polarization wave, P(r), of high-frequency molecular dipoles which appears due to the polarization catas trophe well-known for anisotropic crystals, but not for isotropic gases. The electrodynamic mechanism of the dipole self-organization is the soft mode instability at the finite wavelength λ ~ 7πvT/ω0, whore vT is the thermal velocity, and ω0 is the frequency of molecular transition between the first level and the ground level.
© 1996 IEEE
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