摘要
引言在本系列研究的第Ⅰ部分,我们已对ICP中基体连续辐射的一些性质进行了研究。与Ar连续辐射一样,基体连续辐射强度对电子密度n_c和离子密度n_(M^+)的变化是十分敏感的,与n_c和n_(M^+)成正比,而与T^(1/2)成反比,因为溫度高,电子动能大,要改变其运动形式或运动速度比较困难,因此辐射强度较弱。改变ICP—AES的操作条件因而改变n_c、n_(M^+)、T_e的分布都会导致连续辐射强度的变化。因为ICP是一个空间分布特征不均匀的热、电系统、n_c、n_(M^+)。
Any factors influencing the matrix ion and electron number densities as well as plasma temperature will also affect the continuum intensity emitted by the matrix. This paper presents the results of the study on the effects of several parameters on the continuum background intensity as a function of matrix concentration, Graphs will be presented and detailed explanation fbr the above effects are given. Ca, Mg, and Al were selected as matrix elements. The parameters studied were: concentration, observation height, lateral distance, forward power and the carrier gas flow. The experimental results show that the continuum intensity contributed by the matrix varied in a complex way with the matrix concentrations under different parameters. Optimizing the numerical values of ICP parameters would greatly help to reducing the background shift.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
1991年第5期25-31,共7页
Spectroscopy and Spectral Analysis
基金
国家自然科学基金
