Combined effects of magnetic field and ambient gas condition in the enhancement of laser-induced breakdown spectroscopy signal

In this work, the influence of external magnetic field on the laser-induced breakdown spectroscopy of laser-induced plasma as a function of pressures has been examined. Aluminum samples are analyzed by using Nd:YAG (1064 nm, 8 ns) under helium and argon gases at pressure ranging from 1 to 80 kPa. It is revealed that spectral intensity and plasma parameters are significantly influenced by the presence of magnetic field and ambient gas condition as well. In the presence of magnetic field, emitted intensity of various atomic and ionic lines (384.8 nm, 386.8 nm, 410.4 nm) is found to be higher at various ambient gas pressures. The stark broadening analysis confirms that the values of electron density are increased by the magnetic field at different pressures and distances.