中文摘要：

针对微腔放电（MCD）装置，采用光学发射光谱的方法，通过在氩气中添加少量氮气，分析氮分子第一正带系和氮分子离子第一负带系测量了MCD中的气体温度。实验研究和理论分析表明，氮分子第一正带系测量的气体温度客观正确，而氮分子离子第一负带系测量的气体温度明显偏高，其原因是由于碰撞淬灭效应，Nj（B2）态的有效寿命与转动松弛时间相近，致使转动松弛不完全，转动能级的分布不是平衡态分布，因此所测量的转动温度不能合理体现气体温度。故采用光谱诊断法测量高气压下微等离子体气体温度时，利用氮分子第一正带系更准确合理。

英文摘要：

Microcavity discharge （MCD） is a type of micro-plasma driven by a direct-current source to efficiently generate stable glow plasma at high pressure. The gas temperatures were measured with e- mission spectroscopy diagnosis by analyzing the rotational structures of the N2 first positive and N~ first negative band system with traces of little nitrogen added in argon. Experimental results and theoretical analysis show that the gas temperatures obtained from the N2 band system are slightly above room tem- perature and are reasonable. But the gas temperatures obtained from the N~ band system are so higher. The effective lifetime of N~（ B2 E ~） is comparable to the rotational relaxation time at high pressure, thus the rotational temperature from N~ first negative band system cannot be evaluated as the correct gas temperature