Soft X-ray Absorption/Emission Spectroscopy and Atomic Hydrogen Irradiation Effect of Ammonia Borane
Soft X-ray Absorption/Emission Spectroscopy and Atomic Hydrogen Irradiation Effect of Ammonia Borane
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DOI：
10.1380/ejssnt.2022-042
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发表时间：
2022-08-06
影响因子：
0.7
通讯作者：
Ito, Seigo
中科院分区：
文献类型：
--
作者：
Niibe, Masahito;Haruyama, Yuichi;Ito, Seigo
测量了氨基硼烷(NH3BH3)粉末中B和N原子在K边附近的软X射线吸收和发射光谱。这些光谱显示固体结晶光谱形状，而不是分子光谱。用团簇模型计算的偏态密度与测量的光谱形状符合得很好。此外，为了研究氨基硼烷的反应机理，对氢原子进行了辐照，并用软X射线能谱进行了原位观察。观察到在原子氢辐照下，pi~*吸收峰在B-K吸收谱中分裂为6个峰。其中，高能侧的四个峰被鉴定为六方氮化硼(h-BN)及其氧取代的化学物种。
Soft X-ray absorption and emission spectra near the K-edges of B and N in ammonia borane (NH3BH3) powder are measured. These spectra show a solid crystalline spectral shape rather than a molecular spectrum. The calculation result of partial density of states by a cluster model is in good agreement with the measured spectral shape. In addition, for the purpose of investigating the reaction mechanism of ammonia borane, atomic hydrogen is irradiated, and in-situ observation is performed by soft X-ray spectroscopy. It is observed that pi* absorption splits into six peaks in the B-K absorption spectrum under atomic hydrogen irradiation. Of these, the four peaks on the high-energy side are identified as hexagonal boron nitride (h-BN) and its O-substituted chemical species.