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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Photodissociation of yttrium and lanthanum oxide cluster cations
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Photodissociation of yttrium and lanthanum oxide cluster cations

机译：钇和氧化镧簇阳离子的光解离

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Transition metal oxide cations of the form MnOm+ (M = Y, La) are produced by laser vaporization in a pulsed nozzle source and detected with time-of-flight mass spectrometry. Cluster oxides for each value of n form only a limited number of stoichiometries; MO(M2O3)(x)(+) species are particularly intense. Cluster cations are mass selected and photodissociated using the third harmonic (355 nm) of a Nd:YAG laser. Multiphoton excitation is required to dissociate these clusters because of their strong bonding. Yttrium and lanthanum oxides exhibit different dissociation channels, but some common trends can be identified. Larger clusters for both metals undergo fission to make certain stable cation clusters, especially MO(M2O3)(x)(+) species. Specific cations are identified to be especially stable because of their repeated production in the decomposition of larger clusters. These include M3O4+, M5O7+, M7O10+, and M9O13+, along with Y6O8+. Density functional theory calculations were performed to investigate the relative stabilities and structures of these systems.
机译：MnOm +（M = Y，La）形式的过渡金属氧化物阳离子是通过在脉冲喷嘴源中进行激光蒸发而产生的，并通过飞行时间质谱法进行检测。每个n值的簇状氧化物仅形成有限的化学计量数; MO（M2O3）（x）（+）种类特别强烈。使用Nd：YAG激光的三次谐波（355 nm）对团簇阳离子进行质量选择和光解。由于它们的牢固结合，需要多光子激发来使其离解。钇和镧氧化物具有不同的解离通道，但是可以确定一些共同的趋势。两种金属的较大簇经历裂变以形成某些稳定的阳离子簇，尤其是MO（M2O3）（x）（+）物种。特定阳离子由于在较大簇的分解中反复产生而被确定为特别稳定。这些包括M3O4 +，M5O7 +，M7O10 +和M9O13 +，以及Y6O8 +。进行密度泛函理论计算以研究这些系统的相对稳定性和结构。

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