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Observation of the Hydrogen Migration in the Cation-Induced Fragmentation of the Pyridine Molecules

机译:氢在吡啶分子的阳离子诱导裂解中的迁移观察

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The ability to selectively control chemical reactions related to biology, combustion, and catalysis has recently attracted much attention. In particular, the hydrogen atom relocation may be used to manipulate bond-breaking and new bond-forming processes and may hold promise for far-reaching applications. Thus, the hydrogen atom migration preceding fragmentation of the gas-phase pyridine molecules by the H+, H-2(+), He+, and O+ impact has been studied experimentally in the energy range of 5-2000 eV using collision-induced luminescence spectroscopy. Formation of the excited NH(A(3)Pi) radicals was observed among the atomic and diatomic fragments. The structure of the pyridine molecule is lacking of the NH group, therefore observation of its A(3)Pi -> X-3 Sigma(-) emission bands is an evidence of the hydrogen atom relocation prior to the cation-induced fragmentation. The NH(A(3)Pi) emission yields indicate that formation of the NH radicals depends on the type of selected projectile and can be controlled by tuning its velocity. The plausible collisional mechanisms as well as fragmentation channels for NH formation in pyridine are discussed.
机译:选择性控制与生物学,燃烧和催化有关的化学反应的能力近来引起了很多关注。特别地,氢原子的重定位可用于操纵键断裂和新的键形成过程,并且对于广阔的应用前景可期。因此,使用碰撞诱导发光光谱在5-2000 eV的能量范围内,通过实验研究了气相吡啶分子被H +,H-2(+),He +和O +撞击破碎之前的氢原子迁移。 。原子和双原子碎片之间观察到激发的NH(A(3)Pi)自由基的形成。吡啶分子的结构缺少NH基团,因此观察到其A(3)Pi-> X-3 Sigma(-)发射带是阳离子诱导断裂之前氢原子重新定位的证据。 NH(A(3)Pi)的发射量表明,NH自由基的形成取决于所选射弹的类型,可以通过调节其速度来控制。讨论了在吡啶中形成NH的可能的碰撞机理以及断裂通道。

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