低功率微波等离子体炬（MPT）光源基本性质的初步研究

对低功率微波等离子体炬(MPT)光源基本性质进行了初步研究,采用“双线法”测定了有、无样品引入时光源中激发温度随观测高度的变化;测定了Zn、Cd、Mg的原子线和离子线发射强度随观测高度的变化;还研究了一些实验参数对等离子体激发温度的影响。

A Preliminary Study on Characteristics of Low-Power Microwave Plasma Torch Discharge

The characteristics of low-powered microwave plasma torch discharge are studied. The variation of excitation temperature with the observed height under different experimental conditions was measured by using double-line method. The emission intensities of Zri, Cd, Mg a-tomic and ionic lines were determined. The influence of experimental parameters on the excitation temperatures was also studied. The results show that the variations of emission intensities of analytes with observed height are in accordance with the excitation temperatures. They all have a maximum at the vertical height of 6-7 mm above the torch. The emission in the region of 5-10 mm above the torch is most intense, no matter for soft lines or hard lines. The emission profiles are not related to their excitation energies, but related to the optial structure of MPT discharge.