10-2～105 Pa气压范围的氦等离子体光谱分析

采用三种实验装置(介质阻挡放电装置、空心阴极放电装置和彭宁放电装置)分别测量了不同压强范围内氦等离子体的发射光谱.通过对氦等离子体发射光谱的分析,已观察到一个共同的特点,就是在三种放电条件下产生的氦等离子体中31P1→21S0的谱线强度总是最强,可以推测亚稳态氦原子的含量相当显著,但不同的装置也有不同的特点,介质阻挡放电装置能够产生准辉光放电,谱线中氦原子的谱线强度很低,而空心阴极放电与彭宁放电装置能够产生稳定均匀的等离子体,且发射足够强的光辐射.我们已对所拍摄的光谱的谱线都进行了辨认,所有结果表明原子发射光谱分析法是研究不同条件下氦等离子体状态的一种十分有效的手段.

Spectroscopic Analysis 10-2～105 Pa He gas discharge plasma emission

The emission spectra of He plasma were measured by using three types of experiment devices：dielectric barrier discharge device，hollow-cathode discharge device and Penning discharge device.From thespectral emission under different conditions，the intensity of spectralline31P1→21S0 is always the strongest，probably indicating that high density of metastable helium atoms exists.But we also observeddifferent features in three-type devices.Dielectric barrier discharge device can produce semi-plasma，but the spectrallines of He are very weak.Hollow-cathode discharge and penning discharge can discharge in a staticsteady pressure and the spectral intensity is rather strong.The intensity of spectrallines decreases with the increase of the pressure in penning discharge indicates that the consistenceofmetastable helium atoms variesunder diferent pressures.Spectrallines have been identified.All results indicate that the spectroscopic analysis of atom emission is an effective way to study the state of He plasma under different conditions.