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Inter- and Intramolecular Vibrational Energy Flow in a Formamide- Water Complex

机译:甲酰胺 - 水络合物中的间分子内振动能量流动

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The role of hydrogen bonds in energy redistribution in the cyclic structure of a formamide-water complex has been studied with semiclassical formulations of energy transfer probabilities and solutions of the equations of motion. We show high efficiency of near-resonant vibrational energy from initially excited OH stretching to the first overtone of the bending vibration, which is followed by ultrafast (similar to 100 fs) energy redistribution in the accepting modes of the complex. A strong coupling of the OH bending vibration with the low-frequency modes generated in the hydrogen-bonding intermolecular regions, especially that formed between the water oxygen and formamide hydrogen, plays the key role of ultrafast relaxation of the overtone mode, transferring energy to the hydrogen bonds and distant functional groups in the complex.
机译:研究了氢键在甲酰胺 - 水络合物的环状结构中的能量再分布中的作用,并采用了运动的能量转移概率和运动方程的溶液的分配制剂。 我们从最初激发oh拉伸到弯曲振动的第一个泛音的近谐振振动能量高效率,然后在复合物的接受模式下进行超快(类似于100 fs)能量再分配。 用氢键分子区中产生的低频模式的OH弯曲振动的强耦合,特别是在水氧和甲酰胺氢之间形成,起超越谐波模式的关键作用,将能量转移到 复合物中的氢键和远处官能团。

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