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arXiv 0707.4534physics.chem-phnlin.CD
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存在内转子时高频模式的分子内振动能量再分布:经典厚层扩散和量子局域化

Intramolecular vibrational energy redistribution from a high frequency mode in the presence of an internal rotor: Classical thick-layer diffusion and quantum localization

Paranjothy Manikandan, Srihari Keshavamurthy

摘要:

研究了三自由度模型系统中内转子对经典和量子分子内振动能量再分配(IVR)动力学的影响。该系统基于Martens和Reinhardt(J. Chem. Phys. { \bf 93},5621(1990))提出的哈密顿量。研究对氟甲苯电子激发态的IVR。我们明确地构建状态空间,并显示,证实了Martens和Reinhardt提出的机制,即激发的高频模式通过沿低频转子相互作用产生的厚层混沌扩散而松弛。然而,相应的量子动力学表现出没有明显的弛豫的高频模式。我们属性的经典厚层扩散的量子抑制转子的选择规则,并可能,动态本地化效应。

英文摘要:

We study the effect of an internal rotor on the classical and quantum intramolecular vibrational energy redistribution (IVR) dynamics of a model system with three degrees of freedom. The system is based on a Hamiltonian proposed by Martens and Reinhardt (J. Chem. Phys. {\bf 93}, 5621 (1990).) to study IVR in the excited electronic state of para-fluorotoluene. We explicitly construct the state space and show, confirming the mechanism proposed by Martens and Reinhardt, that an excited high frequency mode relaxes via diffusion along a thick layer of chaos created by the low frequency-rotor interactions. However, the corresponding quantum dynamics exhibits no appreciable relaxation of the high frequency mode. We attribute the quantum suppression of the classical thick-layer diffusion to the rotor selection rules and, possibly, dynamical localization effects.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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