The formation of carbonyl complexes using atom-at-a-time quantities of short-lived transition metals from fusion and fission reactions was reported in 2012. Numerous studies focussing on this chemical system, which is also applicable for the superheavy elements followed. We report on a novel two-chamber approach for the synthesis of such complexes that allows spatial decoupling of thermalization and gas-phase carbonyl complex synthesis. Neutron induced fission on 235 U and spontaneous fission of 248 Cm were employed for the production of the fission products. These were stopped inside a gas volume behind the target and flushed with an inert-gas flow into a second chamber. This was flushed with carbon monoxide to allow the gas-phase synthesis of carbonyl complexes. Parameter studies of the transfer from the first into the second chamber as well as on the carbonyl complex formation and transport processes have been performed. High overall efficiencies of more than 50% were reached rendering this approach interesting for studies of superheavy elements. Our results show that carbonyl complex formation of thermalized fission products is a single-atom reaction, and not a hot-atom reaction.

中文翻译：

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在单原子反应中气相合成具有热裂变碎片的4d过渡金属羰基配合物

2012年报道了使用一次原子量的聚变和裂变反应中的短寿命过渡金属形成羰基配合物的方法。许多研究集中在这种化学体系上，该体系也适用于随后的超重元素。我们报告了一种新颖的两腔方法，用于合成此类配合物，该方法可实现热化和气相羰基配合物合成的空间解耦。中子在235 U上引起的裂变和248 Cm的自发裂变被用于生产裂变产物。这些气体停在目标后面的气体量内，并用惰性气体流冲入第二个腔室。用一氧化碳冲洗，以气相合成羰基配合物。已经进行了从第一室到第二室的转移以及羰基配合物的形成和运输过程的参数研究。达到了超过50％的高整体效率，使这种方法对于超重元素的研究很有趣。我们的结果表明，热裂变产物的羰基配合物形成是单原子反应，而不是热原子反应。