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arXiv 0905.1630physics.chem-phphysics.comp-ph
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利用退相表象有效评估分子量子动力学的准确性

Efficient evaluation of accuracy of molecular quantum dynamics using dephasing representation

Baiqing Li, Cesare Mollica, Jiri Vanicek

摘要:

从头算方法在计算分子的静态性质时已经达到了令人满意的精度,但对于量子动力学计算仍然过于昂贵。我们提出了一种有效的半经典方法来评估较低级别的量子动力学的准确性,相比于较高级别的量子动力学,而不必执行任何量子动力学。该方法是基于量子保真度的退相表示和CO2的光解动力学证明了其可行性。我们建议如何实现现有的分子动力学代码的方法,并描述了一个简单的测试其适用性。

英文摘要:

Ab initio methods for electronic structure of molecules have reached a satisfactory accuracy for calculation of static properties, but remain too expensive for quantum dynamical calculations. We propose an efficient semiclassical method for evaluating the accuracy of a lower level quantum dynamics, as compared to a higher level quantum dynamics, without having to perform any quantum dynamics. The method is based on dephasing representation of quantum fidelity and its feasibility is demonstrated on the photodissociation dynamics of CO2. We suggest how to implement the method in existing molecular dynamics codes and describe a simple test of its applicability.

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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