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研究了在Ne-Ar混合气体辉光等离子体中铝的原子及离子发射光谱线,并与纯Ar和纯Ne辉光等离子体进行了比较。在不同的放电气体环境下,Al发射线的相对强度不同。在Ne为放电气体时,可以观察到由4f→3d跃迁而产生的AlⅡ358.71 nm和AlⅡ358.66 nm两条发射线,而这两条线在以Ar为放电气体时不会产生。这种现象的原因是由于4f激发态是由Al原子和Ne离子的共振电荷转移碰撞而选择性高几率的产生的。由于亚稳态的Ne与Ar原子的彭宁碰撞会产生大量的Ar离子,因此在Ne等离子体中加入少量的Ar气时,会增加等离子体中气体离子的数量和电子密度。这种在Ne-Ar混合气体中发生的变化导致Al光谱线的发射强度增强。在Al的原子线和离子线中,AlⅡ358.641可被用来作为痕量Al检测的分析线。因为该线在Ne-Ar混合气体等离子体中的强度高,背景低。
The atomic and ion emission spectra of aluminum in the Ne-Ar mixed gas glow plasma were studied and compared with pure Ar and pure Ne glow plasmas. In different discharge gas environment, the relative intensity of Al emission line is different. When Ne is a discharge gas, two emission lines Al358.71 nm and Al II358.66 nm resulting from the 4f → 3d transition can be observed, and these two lines do not occur when Ar is a discharge gas. The reason for this phenomenon is that the 4f excited state is selectively and selectively generated by the collision and transfer of resonant charge of Al atoms and Ne ions. Due to the large number of Ar ions colliding with the Penning collisions of metastable Ne and Ar atoms, adding a small amount of Ar gas into the Ne plasma will increase the number of gas ions in the plasma and the electron density. This change in the Ne-Ar gas mixture results in enhanced emission intensity of Al spectral lines. Al II 358.641 can be used as an analytical line for the trace Al detection in Al atomic and ion lines. The background is low because of the high intensity of this line in the Ne-Ar mixed gas plasma.