Interaction induced localization in a gas of pyramidal molecules

Details Interaction induced localization in a gas of pyramidal molecules Interaction induced localization in a gas of pyramidal molecules

2001-07-16

arxiv.org/abs/cond-mat/0107342v2

Phys.Rev.Lett. 88 (2002) 123001

Physics

Condensed Matter

4 pages, 1 figure

Scientific paper

10.1103/PhysRevLett.88.123001

We propose a model to describe a gas of pyramidal molecules interacting via dipole-dipole interactions. The interaction modifies the tunneling properties between the classical equilibrium configurations of the single molecule and, for sufficiently high pressure, the molecules become localized in these classical configurations. We explain quantitatively, without free parameters, the shift to zero frequency of the inversion line observed upon increase of the pressure in a gas of ammonia or deuterated ammonia. For sufficiently high pressures, our model suggests the existence of a superselection rule for states of different chirality in substituted derivatives.

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