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首页> 外文期刊>The Journal of Chemical Physics >An imaging photoelectron-photoion coincidence investigation of homochiral 2R,3R-butanediol clusters
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An imaging photoelectron-photoion coincidence investigation of homochiral 2R,3R-butanediol clusters

机译：Homochiral 2R，3R-丁二醇簇的成像光电子 - 光相结合研究

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摘要

We report an experimental investigation of homochiral cluster formation in seeded molecular beam expansions of (2R, 3R)-butanediol. Synchrotron radiation vacuum ultraviolet photoionization measurements have been performed using a double imaging electron-ion spectrometer in various configurations and modes of operation. These include measurements of the cluster ion mass spectra, wavelength scanned ion yields, and threshold electron spectra. Protonated cluster ions ranging up to n = 7 have been observed and size-selected photoelectron spectra and photoelectron circular dichroism (PECD) have been recorded by velocity map imaging, recorded in coincidence with ions, at a number of fixed photon energies. Translation temperatures of the cluster ions have been further examined by ion imaging measurements. As well as the sequence of protonated clusters with integral numbers of butanediol monomer units, a second series with half-integral monomer masses is observed and deduced to result from a facile cleavage of a butanediol monomer moiety within the nascent cluster. This second sequence of half-integral masses displays quite distinct behaviours. PECD measurements are used to show that the half-integral mass cluster ions do not share a common parentage with whole integer masses. Using an analogy developed with simple theoretical calculations of butanediol dimer structures, it is inferred that the dissociative branching into integral and half-integral ion mass sequences is controlled by the presence of different butanediol monomer conformations within the hydrogen bonded clusters. Published by AIP Publishing.
机译：我们报告了（2R，3R） - 丁二醇的种子分子束膨胀中的初组簇形成的实验研究。通过各种配置和操作模式，使用双重成像电子离子光谱仪进行了同步辐射真空紫外线离子激素测量。这些包括簇离子质谱，波长扫描离子产量和阈值电子光谱的测量值。已经观察到高达n = 7的质子化簇离子，并且已经通过速度映射成像记录了尺寸选择的光电子谱和光电子圆形二色（PECD），在多个固定的光子能量下以符合离子吻合。通过离子成像测量进一步检查了簇离子的介金温度。除了丁二醇单体单元的整体数量的质子化簇的序列，观察到具有半整体单体肿块的第二序列，并推导出由鼻肠内簇内的丁二醇单体部分的容易切割产生。第二个半积分的第二个序列显示出相当不同的行为。 PECD测量用于显示半积分簇离子不与整个整数群众共享常见的父群。使用用简单的丁二醇二聚体结构的简单理论计算开发的类比，推断下分离分支成一体化和半积分离子序列由氢粘结簇内的不同丁二醇单体构象的存在来控制。通过AIP发布发布。

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