Lattice of Partly Permanent Dipoles

Lattice of Partly Permanent Dipoles

Melting of Wigner-like Lattice of Parallel Polarized Dipoles

About thirty years ago, Nelson and Halperin [1] extended the Kosterlitz-Thouless pair unbinding theory [2] of vortices in a thin layer of superfluid helium to the phase transitions of defects in two-dimensional crystals. They argued that melting would proceed by a sequence of two Kosterlitz-Thouless transition, the first when dislocations of opposite Burgers vector unbind, creating a hexatic ph...

Electro-optic Investigation of the Permanent and Induced Dipoles of Montmorillonite as Affected by Electrolyte Concentration

Abstrae~An electro-optic birefringence technique was employed to study the orientation mechanism of montmorillonite in an electric field. The instantaneous reversal of the field polarity produced evidence of a low voltage permanent dipole and a high voltage induced dipole. This technique was used to study the effect o felectrolyte concentration on the rotational diffusion coefficient, a measure...

Formation of cyanopolyyne anions in the interstellar medium: the possible role of permanent dipoles.

The possibility of attaching near-threshold electrons to N-terminated carbon chains, like those observed in the outer envelopes of carbon-rich stars, is examined via accurate quantum chemistry orbital structures evaluation and quantum scattering analysis of the corresponding extra-electron wavefunctions at meV energies. It is shown that the differences in the signs and sizes of the permanent di...

Nonlinear response of permanent dipoles in a uniaxial potential to alternating fields.

It is shown how the existing theory of the dynamic Kerr effect and nonlinear dielectric relaxation based on the noninertial Brownian rotation of noninteracting rigid dipolar particles may be generalized to take into account interparticle interactions using the Maier-Saupe mean field potential. The results (available in simple closed form) suggest that the frequency dependent nonlinear response ...