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影响钢中碳的检出限的主要原因之一,就是重叠在 CⅢ229.7纳米上的铁原子线Fe Ⅰ229.7纳米及在其近旁的 FeⅡ229.7纳米。碳线是激发能为18电子伏的二次离子线,而相干扰的铁线是一次和二次离子线。那么可想到,它们应当在不同的放电层中激发。研究碳线和干扰铁线的径向强度分布是有意义的。将放电像投射到狭缝上,且使其轴线与仪器的光轴重合。电极的设置如图1
One of the main reasons that affect the detection limit of carbon in steel is that the iron atom line Fe Ⅰ 229.7 nm overlaid on CⅢ229.7 nm and the229.7 nm FeⅡ near it. The carbon line is a secondary ion line with an excitation energy of 18 eV and the interfering wire is a primary and secondary ion line. It is conceivable that they should be excited in different discharge layers. It is significant to study the radial strength distribution of carbon and interference wires. The discharge image is projected onto the slit with its axis coincident with the optical axis of the instrument. Electrode settings shown in Figure 1