Environment induced localization and superselection rules in a gas of pyramidal molecules

Details Environment induced localization and superselection rules in a gas of pyramidal molecules Environment induced localization and superselection rules in a gas of pyramidal molecules

2001-07-16

arxiv.org/abs/cond-mat/0107341v1

Fields Inst.Commun. 30 (2001) 207-217

Physics

Condensed Matter

10 pages, 1 figure

Scientific paper

We propose a model to describe a gas of pyramidal molecules interacting via dipole-dipole interactions. A cooperative effect induced by the interaction modifies the tunneling properties between the classical equilibrium configurations of the single molecule. The model suggests that, for sufficiently high gas density, the molecules become localized in these classical configurations. On this basis it is possible to explain the shift and the disappearance of the inversion line observed upon increase of the pressure in a gas of ammonia or deuterated ammonia. The same mechanism also accounts for the presence of stable optical activity of certain pyramidal molecules. We discuss the concept of environment induced superselection rule which has been invoked in connection with this problem.

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