Influence of gas pressure on the magnetized plasma parameters of laser-induced breakdown

• Published in: Optical and quantum electronics 2023-10, Vol.55 (10), Article 899
• Main Authors: Abbas, Zahraa Marid, Abbas, Qusay Adnan
• Format: Article
• Language: English
• Subjects: Argon; Characterization and Evaluation of Materials; Computer Communication Networks; Electrical Engineering; Emission analysis; Emission spectra; Gas pressure; Laser induced breakdown spectroscopy; Lasers; Low pressure; Magnetic fields; Neodymium lasers; Optical Devices; Optics; Photonics; Physics; Physics and Astronomy; Plasma; Plasma temperature; Q switched lasers; Semiconductor lasers; Spectrum analysis; YAG lasers; Zinc oxide
• ISSN: 0306-8919; 1572-817X
• DOI: 10.1007/s11082-023-05163-3

In this study, the effect of environment gas and working pressure of laser-induced breakdown spectroscopy from ZnO: Al composite target (AZO) enhanced by an external magnetic field on the magnetized characteristics and emission spectra of plasma were investigated. The plasma was induced by a Q-switched nanosecond Nd: YAG laser at a constant pulse laser energy of 300 mJ at different pressures of 0.08, 0.2, 0.4, and 760 Torr in air and argon gas. The atomic and ionic emission lines increased in intensity directly with the working pressure. The plasma temperature ( T e ) and electron number density ( n e ) were determined at the different environmental conditions according to the intensity-ration method, and Stark broadening effect, respectively. Both n e and T e increased with increasing pressure and with the presence of magnetic field as a result of confining effect. The line profile appeared with high broadening at atmospheric pressure compared with vacuumed plasma. The Larmur radius and confinement factor β increased with working pressure. From another hand, using Ar instead of air caused slightly reduced n e at low pressure, while T e has the opposite behavior.