Bimolecular radical scavenging processes for laser isotope separation: NH2D + O2 |
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| Institution: | 1. Key Laboratory of Interface Science and Engineering in Advanced Materials of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China;2. Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China;3. National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083, China;4. Institute of Materials, Chinese Academy of Engineering Physics, Jiangyou 621908, China;1. University of Warsaw, Faculty of Physics, 00-092 Warsaw, Pasteura 5, Poland;2. Interdisciplinary Centre for Mathematical and Computational Modelling (ICM), University of Warsaw, Pawinskiego 5a, 02-106 Warsaw, Poland;3. Theoretische Festkörperphysik, Humboldt-Universität zu Berlin, Zum Großen Windkanal 6, 12489 Berlin, Germany |
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| Abstract: | Infrared multiphoton photooxidation of NH2D in NH3 mixtures was observed to produce exclusively HDO, suggesting a single step deuterium separation efficiency of D2O]/(D20]+H2O]) ⩾ 50% which is significantly higher than that of the theoretical value, 33%. The results are explained by the large rate differences in the radical scavenging steps, i.e. k(D+O2) = 2.2 × 109M−1 s−1, k(NH2+O2) ⩽ 5 × 106 M−1 s−1 and k(NH2+NH2)=1.6 × 1010 M−1 s−1. With Ti solid powder as a catalyst, we observed that the formation yields of HDO are at least three to four times higher than those without a catalyst. |
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