In this report, an impact of applied-magnetic field on laser induced breakdown spectroscopy (LIBS) emission with different air pressures and several time delays was explored by analyzing the solid aluminum (Al) sample. A Neodymium-doped yttrium aluminum garnet (Nd:YAG) laser at its basic wavelength (1064 nm) was utilized to generate the plasma and its optical emission was recorded with the help of an optical emission spectroscopy (OES) technique. A notable improvement was observed primarily at low pressure and shorter delay time for Al atomic lines due to the effect of magnetic field (0.5 T). For the air pressure of 100 Pa and delay time of 100 ns, the signal enhancement of approximately 2-fold was obtained for Al (I) 396.1 nm spectral line. The signal enhancement due to the magnetic confinement was attributed to an increase in electron-impact excitation rate and recombination processes. The plasma parameters like, electron temperature (T_e) and electron number density (n_e) were also affected under the applications of magnetic field. A considerable enhancement was noticed in comparison to the field-free case. The plasma temperature attained their highest values at 500 Pa only, however, the electron density was found to be completely enhanced across the magnetic field. The optical enhancement is accredited to the plasma-confinement by applied field and has scope in improving the LIBS sensitivity.

在本报告中，通过分析固体铝 (Al) 样品，探讨了外加磁场对具有不同气压和若干时间延迟的激光诱导击穿光谱 (LIBS) 发射的影响。使用基本波长 (1064 nm) 的掺钕钇铝石榴石 (Nd:YAG) 激光器来产生等离子体，并借助光发射光谱 (OES) 技术记录其光发射。由于磁场 (0.5 T) 的影响，主要在低压和更短的延迟时间下观察到铝原子线的显着改善。对于 100 Pa 的气压和 100 ns 的延迟时间，Al (I) 396.1 nm 谱线的信号增强了大约 2 倍。由于磁约束引起的信号增强归因于电子撞击激发速率和复合过程的增加。等离子体参数，如电子温度 (T_e ) 和电子数密度( _ne ) 在磁场作用下也受到影响。与无场情况相比，注意到了相当大的增强。等离子体温度仅在 500 Pa 时达到最高值，然而，发现电子密度在整个磁场中完全增强。光学增强被应用领域认可为等离子体限制，并具有提高 LIBS 灵敏度的范围。