Optical isolation of the clockwise or the counter-clockwise circular polarization of spectral lines was applied to emission of sputtered tungsten atoms. As a result one measures the weak magnetic field at plasma-surface interface resulting in splitting of spectral lines (W I at 4008.751 and 4982.593 ) being negligibly small with respect to the Doppler broadening. One relies only on the phase rotation of a reflected circular polarized light propagating at the normal incidence to the mirror-like surface. The spectral shift of the signal from sputtered W atoms on the detector using high-resolution spectrometer provides the value of the magnetic field at a known dispersion, i.e. no further modeling or additional assumption on the distribution of atoms is required. The isolation of spectral line components is equivalent to isolation of the effect of the magnetic field from the measured line shape. It is complete for Zeeman triplet lines and partial for other lines. The results are found to be in a very good agreement of 3% with calculations and the Zeeman resolved laser absorption spectroscopy (10%) on metastable levels of Ar I atoms.

将光谱线的顺时针或逆时针圆极化的光学隔离应用于溅射钨原子的发射。结果，一种措施是测量等离子体-表面界面处的弱磁场，从而导致谱线的分裂（4008.751和4982.593处的WI）相对于多普勒展宽而言可以忽略不计。一个仅依赖于以垂直入射方向传播到镜面的反射圆偏振光的相位旋转。使用高分辨率光谱仪从探测器上溅镀的W原子发出的信号的光谱偏移提供了已知色散下的磁场值，即，无需对原子分布进行进一步建模或额外假设。频谱线分量的隔离等效于将磁场的影响与测量的线形隔离。对于Zeeman三元组线是完整的，而对于其他线则是部分的。计算结果与Ar I原子的亚稳水平和Zeeman解析激光吸收光谱法（10％）非常吻合，为3％。