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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Relaxation dynamics of NH stretching vibrations of 2-aminopyridine and its dimer in a supersonic beam
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Relaxation dynamics of NH stretching vibrations of 2-aminopyridine and its dimer in a supersonic beam

机译：超声波束中2-氨基吡啶及其二聚体的NH伸缩振动的弛豫动力学

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摘要

Picosecond time-resolved IR-UV pump-probe spectroscopy has been carried out to elucidate vibrational energy relaxation (VER) of the NH stretching vibrations of 2-aminopyridine monomer (2AP) and dimer [(2AP)_2] in supersonic beams. In bare 2AP, intramolecular vibrational energy redistribution (IVR) of the NH vibrations is described by the two-bath mode model, in which the initial vibrational energy flows to the doorway states rapidly (6.5 ps) and then dissipates into the dense bath states with a time constant of ≈20 ps. No clear difference was observed in the IVR lifetime between the symmetric and asymmetric NH_2 stretch modes. In (2AP)_2, IVR and vibrational predissociation (VP) were involved in VER. It was found that the rate constants of both IVR and VP of the hydrogen-bonded NH stretching vibration are larger than those of the free NH.
机译：已经进行了皮秒时间分辨的IR-UV泵浦光谱研究，以阐明超声速声束中2-氨基吡啶单体（2AP）和二聚体[（2AP）_2]的NH拉伸振动的振动能弛豫（VER）。在裸露的2AP中，NH 2振动的分子内振动能重新分布（IVR）由两浴模式模型描述，在该模型中，初始振动能迅速（6.5 ps）流到门道状态，然后耗散到稠密的浴状态下。约20 ps的时间常数。在对称和不对称NH_2拉伸模式之间的IVR寿命中没有观察到明显差异。在（2AP）_2中，IVR和振动预离解（VP）参与了VER。发现与氢键结合的NH拉伸振动的IVR和VP的速率常数都大于游离NH的速率常数。

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