Effects of molecular symmetry on the directions of nuclear flux densities during tunnelling in double well potentials

Effects of molecular symmetry on the directions of nuclear flux densities during tunnelling in double well potentials
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双势阱隧道效应中分子对称性对核通量密度方向的影响

DOI:
10.1080/00268976.2013.800599
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发表时间:
2013
期刊:
影响因子:
1.7
通讯作者:
A. Schild
A. Schild
中科院分区:
化学4区
文献类型:
--
作者:
T. Grohmann;J. Manz ;A. Schild

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在具有循环和非循环对称双阱势的分子系统中,相干隧穿可以在核密度相似的情况下进行,但通量密度完全不同。对于足够高的势垒,核密度甚至可能变得难以区分,而在给定时间内,循环系统的通量密度模式仍然是钳动型,而非循环系统的通量密度模式是单向的。这种效应可以追溯到循环到非循环模型的对称破缺。因此,核通量密度对对称破缺比核密度敏感得多。为了证明这一现象的原理,我们用三个一维模型来证明这一现象。循环模型I表示有向B2Cl2F2中的扭转,非循环模型II通过对称破缺构建,非循环模型III表示有向NH3的反演隧道作用。
Coherent tunnelling in molecular systems with cyclic and non-cyclic symmetric double well potentials may proceed with similar nuclear densities, but with entirely different flux densities. For sufficiently high potential barriers, the nuclear densities may even become indistinguishable, whereas the patterns of the flux densities at a given time remain pincer-motion type for the cyclic systems, but unidirectional for the non-cyclic one. This effect is traced back to symmetry breaking of the cyclic to the non-cyclic model. Accordingly, nuclear flux densities are much more sensitive to symmetry breaking than nuclear densities. For a proof of principle, the phenomenon is demonstrated by means of three one-dimensional models. The cyclic model I represents torsion in oriented B2Cl2F2, the non-cyclic model II is constructed from I by symmetry breaking and the non-cyclic model III represents tunnelling by inversion of oriented NH3.
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