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首页> 外文期刊>The Journal of Chemical Physics >RESONANT VIBRATIONAL EXCITATION IN HIGH-RESOLUTION ELECTRON ENERGY-LOSS SPECTROSCOPY STUDIES OF TRIMETHYLAMINE CHEMISORBED ON GAAS(100)
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RESONANT VIBRATIONAL EXCITATION IN HIGH-RESOLUTION ELECTRON ENERGY-LOSS SPECTROSCOPY STUDIES OF TRIMETHYLAMINE CHEMISORBED ON GAAS(100)

机译：GAAS（100）上三乙胺的高分辨电子能谱中的共振振动激发

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摘要

High-resolution electron energy-loss spectroscopy has been used to study the vibrational properties of trimethylamine [(CH3)(3)N] chemisorbed on GaAs(100) at room temperature. A number of vibrational modes of the adsorbate, involving both the C-H and C-N bonds, are preferentially excited via a resonance scattering mechanism involving the formation of a temporary negative ion due to capture of the incident electrons. The resonance, which is centered around 6 eV, is characterized by a large enhancement in the intensity of several fundamental vibrations and the appearance of a number of combination and overtone bands. Detailed energy-dependent studies and comparison with previous electron scattering studies of related gas phase molecules suggest that electron capture can occur in three molecular orbitals of the adsorbed molecule. By considering the electron density distributions obtained from semiempirical calculations of the isolated molecule, an assignment of the vibrational modes which are selectively excited due to occupation of a specific molecular orbital has been attempted. (C) 1996 American Institute of Physics. [References: 39]
机译：高分辨率电子能量损失谱已用于研究在室温下化学吸附在GaAs（100）上的三甲胺[（CH3）（3）N]的振动性质。优先通过共振散射机制激发涉及C-H和C-N键的吸附物的多种振动模式，该共振散射机制由于捕获入射电子而形成临时的负离子。以6 eV为中心的共振的特点是，几个基本振动的强度大大增强，并出现了许多组合和泛音带。详细的能量依赖研究以及与相关气相分子先前的电子散射研究的比较表明，电子捕获可以发生在吸附分子的三个分子轨道上。通过考虑从孤立分子的半经验计算获得的电子密度分布，已尝试分配由于占据特定分子轨道而被选择性激发的振动模式。 （C）1996年美国物理研究所。 [参考：39]

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