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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >CD3 Deformation Modes as Preferential Promoters of Methylamine-d(3) to the First Electronic State
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CD3 Deformation Modes as Preferential Promoters of Methylamine-d(3) to the First Electronic State

机译：CD3变形模式作为甲胺-d（3）向第一个电子态的优先促进者

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摘要

The room-temperature photoacoustic Raman and jet cooled H action spectra, measured in the region of the fundamental CD3 stretches and the almost isoenergetic overtones or combinations of CD3 deformations in the methylamine-d(3) (CD3NH2) isotopologue, show different relative intensities of the vibrational bands. The observed difference and the vibrational assignment point to favored ultraviolet excitation due to larger Franck-Coridon (FC) factors from the deformation modes, leading to more effective N-H bond cleavage in CD3NH2 predissociation. The comparable measured two-color reduced-Doppler ion images and total kinetic energy distributions resulting from the predissociation of molecules promoted from vibrationally excited and vibrationless ground states confirmed that the FC factors and not the ensuing dynamics are the main reason for the mode specificity in this molecule.
机译：室温光声拉曼光谱和射流冷却的H动作光谱在基本CD3拉伸区域和甲胺-d（3）（CD3NH2）同位素分子中几乎等能量的泛音或CD3变形的组合中测量，显示出不同的相对强度。振动带。观察到的差异和振动分配点归因于变形模式中较大的Franck-Coridon（FC）因素，有利于紫外线激发，从而导致CD3NH2预离解中更有效的N-H键裂解。可比较的测量的两色还原多普勒离子图像和由振动激发和无振动基态促进的分子的预离解所产生的总动能分布证实，FC因子而非随后的动力学是造成模式特异性的主要原因分子。

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