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Intensity tracking for theoretical infrared spectroscopy of large molecules

机译:大分子理论红外光谱的强度跟踪

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We present an approach for the direct calculation of vibrational normal modes with high infraredintensities based on a mode-tracking-like algorithm [M. Reiher and J. Neugebauer, J. Chem. Phys.118, 1634 (2003)] but with distinct features: no collective guess vibration is utilized buthigh-intensity distortions are constructed. Only the modes of interest with the highest infraredintensities are then targeted irrespective of a predefinition of the underlying collective normalcoordinates. This leads to a fast access to the most important features in infrared spectra. Thedifferent implementations of the mode selection procedure are validated on a set of small organicmolecules as well as on the metal complex L1(888)-tris(ethylenediaminato)cobalt(11I) and thepeptide all-(S)-decaalanine. As a critical test case, approximate infrared spectra of Schrock'sdinitrogen molybdenum complex are calculated via intensity tracking.
机译:我们提出了一种基于类似模式跟踪算法的直接计算具有高红外强度的振动法线模式的方法。 Reiher和J. Neugebauer,J。Chem。 Phys.118,1634(2003)],但具有鲜明的特征:没有利用集体猜测振动,而是构造了高强度失真。然后,仅针对具有最高红外强度的感兴趣模式,而无需考虑基础集体法向坐标的预定义。这样可以快速访问红外光谱中最重要的功能。模式选择程序的不同实现在一组小的有机分子以及金属络合物L1(888)-三(乙烯二氨基)钴(11I)和肽全-(S)-十丙氨酸上得到了验证。作为一个关键的测试案例,通过强度跟踪计算出了Schrock's二氮钼配合物的近似红外光谱。

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