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用计算机化断层扫描成象技术研究了微波等离子体炬(MPT)放电的发射轮廓,证明该光源具有良好的对称性,并有一个有利于样品引入的中央通道,最佳分析区在炬管上方5～10 mm,用激光Thomson散射和Rayleigh散射技术测定了ArMPT和HeMPT放电的电子温度、电子密度和气体温度,证明MPT放电的电子温度很高而气体温度较低,是一种非热光源。其中的高能电子处于过布居状态,具有很高的激发能力。
The emission profile of a microwave plasma torch (MPT) discharge was studied using computerized tomography (CT) imaging technology to demonstrate good symmetry of the light source and a central channel for sample introduction with the best analysis zone above the torch 5 ~ 10 mm. The electronic temperature, electron density and gas temperature of ArMPT and HeMPT discharges were measured by laser Thomson scattering and Rayleigh scattering. It is proved that MPT discharge has a high electron temperature and a low gas temperature and is a non-thermal light source. One of the high-energy electronic overbased state, with high excitation ability.