【摘要】 采用Ｘ射线光电子能谱（ＸＰＳ）分析研究了２９８ Ｋ时Ｏ２在金属Ｕ和 Ｕ－Ｎｂ合金清洁表面的原位吸附过程，作为对照还研究了在纯 Ｎｂ表面的吸附吸附各阶段 ＸＰＳ图谱的变化揭示了Ｏ２在Ｕ，Ｎｂ和 Ｕ－Ｎｂ合金表面的吸附将导致ＵＯ２； ＮｂＯ和 Ｎｂ２Ｏ５等多种产物形成定量分析表明，Ｏ２在 Ｕ和 Ｕ－Ｎｂ合金表面的饱和吸附量大约分别为４５Ｌ和４０Ｌ（１Ｌ＝１．３３×１０－４　Ｐａ·ｓ），而Ｏ２在金属Ｎｂ上的饱和吸附量仅约为１０Ｌ．更多还原

【Abstract】 The surface adsorptions of dry oxygen on uranium and uranium-niobium alloy at 298 K was investigated by X-ray photoelectron spectroscopy (XPS). For comparison, the adsorption of oxygen on pure niobium has been also studied. XPS spectral features suggest that oxygen adsorptions on uranium, niobium and uranium-niobium alloy surfaces led to the formation of UO2, NbO and Nb2O5. Quantitative analysis indicates that the saturation coverages on uranium and uranium-niobium alloy are approximately 45 L and 40 L exposure, respectively. However, the saturation adsorption on niobium is found to be 10 L(1 L =1.33 ×10-4 Pa.s)更多还原