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Atomic Emission Spectroscopy for Element Analysis
Description
Atomic emission spectroscopy is used to identify the elements in a sample by measuring the light they emit. Atoms are first excited to higher energy levels by thermal energy from hot sources such as plasma, arcs, or sparks. When they fall back to lower energy levels, they give off light at specific wavelengths. Each element ...
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Transcript
原子发射光谱法(AES)可实现样品中多种元素的同时分析,其中所有待测元素均可通过电弧放电、火焰或等离子体被同时激发。
在原子发射光谱法(AES)中,处于激发态的原子弛豫并产生特征发射,发射强度与激发态原子数量成正比。
通过采用高温氩等离子体,可获得大量处于激发态的原子。
氩等离子体——一种由氩离子和电子组成的高温、导电气态混合物——是通过电离流动的氩气而产生的。该等离子体由电源持续维持,电源保持最适宜的温度以实现进一步电离。
一种基于射频的等离子体源,称为电感耦合等离子体(inductively coupled plasma,ICP),其温度可达10,000 K。它在原子发射光谱法(AES)中被广泛用作激发源,通常被称为ICP–...
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