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Reactivity of Iron Atoms at Low Temperature

机译:低温下铁原子的反应性

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摘要

We have studied the reactions of iron atoms and clusters with oxygen, acetylene, and water molecules in superfluid He droplets at T = 0.37 K. For all systems, the formation of weakly bound adducts was found, but the insertion reaction of iron into existing molecular bonds could not be observed. The formation of FeOH_2 and FeC_2H_2 complexes was evidenced by mass spectrometry. However, it was found that the reaction of iron atoms with oxygen molecules under similar conditions leads to the stabilization of an intermediate reaction product, the weakly bound linear FeOO adduct, which undergoes complete dissociation upon electron impact ionization. All reactions observed are not expected to proceed in the gas phase. The R2PI spectrum of the y~5D_4~0 ← a~5D_4 atomic transition of Fe solvated in helium droplets was recorded. A relatively small blue shift of ~120 cm~(-1) with respect to the gas phase position was found.
机译:我们研究了T = 0.37 K时超流体He液滴中铁原子和团簇与氧,乙炔和水分子的反应。对于所有系统,均发现了弱结合的加合物的形成,但铁在现有分子中的插入反应无法观察到债券。质谱证明了FeOH_2和FeC_2H_2配合物的形成。然而,发现在相似条件下铁原子与氧分子的反应导致中间反应产物,即弱结合的线性FeOOO加合物的稳定化,该产物在电子碰撞电离时经历完全离解。观察到的所有反应都不会在气相中进行。记录了在氦滴中溶剂化的Fe的y〜5D_4〜0←a〜5D_4原子跃迁的R2PI光谱。发现相对于气相位置的相对较小的蓝移为〜120 cm〜(-1)。

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