Orientational Dielectric Relaxation of Collisionless Molecules
1990; American Association for the Advancement of Science; Volume: 247; Issue: 4950 Linguagem: Inglês
10.1126/science.247.4950.1572
ISSN1095-9203
AutoresFrancis W. Farley, Gary M. McClelland,
Tópico(s)Surfactants and Colloidal Systems
ResumoThe generation of the orientation component of the polarization of matter in an electric field has previously been thought to require interaction of molecules with their neighbors. It is demonstrated that, even in the absence of collisions between neighboring molecules, hot isolated polyatomic molecules can reorient in response to an external field, thereby giving rise to the orientation component of polarization. This reorientation occurs through the interaction of rotation with molecular vibrations, which provides a heat bath to establish thermal rotational equilibrium. This effect is demonstrated for o -difluorobenzene, o -dichlorobenzene, and p -chlorotoluene, with an inhomogeneous electric field used to deflect molecular beams of these molecules.
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