空气—氩气混合气冷却ICP中镁,铬,镉,锰四种元素的谱线强度和信背比的 …

The dependence of net analyte emission intensity and signal-background ratio on coolant gas composition and observation heights for 8 lines of four elements (Mg, Cr, Cd and Mn) in Ar-air mixed coolant gas ICP was measured under the similar condition as that in the low power Ar-ICP with a commercial sequential plasma spectrometer. Further, the detection limits under compromise conditions were estimated. The results show that ion lines and neutral atom lines with high excitation energy have maximum intensity and are more intense than those in the Ar-ICP, when 5-10% air is added to the coolant flow. The intensity of neutral atom lines with low excitation energy drops gradually as air is added to coolant flow. The signal-background ratio of analyte lines depends upon excitation energy and wavelength.     

对电力线教学的一些探讨和体会

介绍在电力线的教学中进行的一些尝试和探讨，说明在普通物理阶段电力线的重要性和实用性。     

基于2×2光开关的光交换系统研究

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