元素在石墨炉内石墨探针表面上的原子化机理研究（ⅩⅣ）──钐的原子化机理

Studies on the Atomization Mechanism of Sanmarium on the Graphite Probe Surface in the Graphite Furnace

综合运用Ｘ射线衍射、Ｘ射线光电子能谱与俄歇电子能谱等表面分析手段研究了石墨炉中石墨探针表面钐样品的原子化过程。发现在石墨炉升温过程中，钐样品先转化为Ｓｍ_２Ｏ_３，再由Ｓｍ_２Ｏ_３热分解为ＳｍＯ，原子化起源于ＳｍＯ的热分解；在Ｓｍ_２Ｏ_３与探针接触的表面有碳化物生成，碳化物是造成记忆效应的重要原因。

In this paper,atomization mechanism of Sm(NO3)3 and Sm2O3 on the graphite probe surface in the graphite furnace was investigated experimentally using X-ray diffraction spectrometry.X-ray photoelectron spectroscopy and Auger electron spectroscopy.It showed that in the course of atomization,the samarium samples firstly decomposed into Sm2O3 then converted into SmO and samarium carbide,the atomization of samarium originated from the thermal decomposition of SmO,the formation of refractory carbide accounted for the severe memory effect of determination.