Magnetically confined LIBS; Diatomic transition lines; TiO gamma;INDUCED BREAKDOWN SPECTROSCOPY; OPTICAL-EMISSION; LASER; ALLOYS; FIELD; ENHANCEMENT; NDYAG

This paper is focused on the clarification of the behaviour of various atomic, ionic, and TiO gamma (A(3)Phi-X-3 Delta, Delta v =0) diatomic transition lines as well as the continuum radiations in laser-induced titanium plasma plume by a pair of NdFeB. Depending on their different amount of impressionability from applied fields and electron-impact excitation rate, the responses of each component in optical emission spectrum and background continuum radiation to different applied magnetic field strengths (similar to 0.42-1.12 T) are significantly different. At magnetic fields of 0.98 and 1.12 T, the amount of impressionability for Ti i: 388.2 nm is higher than others, while for TiO gamma molecular transitions, the amount of impressionability factor in a 0.98 T field strength is considerable, because in the first moments after the laser pulse the continuum radiation is dominant, by applying an external magnetic field, this amount of radiation be reduced. The temporal evolution of the optical emission lines shows that choosing a suitable time delay and gate width has a considerable role in further impressionability of externally applied field in case of different elements. The electron density Ne varied from 0.99x10(17) to 11.53x10(17) cm(-3), and the plasma temperature T-e, was obtained in a range of 4835-16818 K by employing maximum applied field of 1.12 T. The supplementary investigations will be conducted towards further improvements of the purposeful analysis of each component in confined plasma by magneto-LIBS technique in order to find new approaches in the field of magnetic confinement.

Laser-induced breakdown spectroscopy (LIBS); Magnetic properties; Uniaxial anisotropy;INDUCED BREAKDOWN SPECTROSCOPY; LASER-PRODUCED PLASMA; OPTICAL-EMISSION; SAMPLE TEMPERATURE; ALLOYS

Laser-induced breakdown spectroscopy (LIBS) has been investigated as a potential analytical tool for better understanding the role of sample temperature and magnetization on the optical emission of laser-induced plasma for NdFeB sample. The mechanism of optical emission by increasing of sample temperature (T (s) ) and plasma confinement including shock wave in the presence of magnetic field is discussed. The heated samples show a significant decrease in magnetic properties, especially the coercivity and saturation of magnetization. The coercivity and saturation of magnetization of NdFeB were 15000 Oe and 95 emu/g, respectively. The intensity of emission lines decreased with an increase in T (s) for NdFeB sample. The coercivity and saturation of magnetization of samples was monotonically decreased and caused to decrease in LIBS signal intensities.

INDUCED BREAKDOWN SPECTROSCOPY; COMBUSTION CHEMISTRY; POTASSIUM RELEASE; IDENTIFICATION; PRESSURE

Laser-induced breakdown spectroscopy (LIBS) technique is used to record some plasma emissions of different laminar diffusion methanol, ethanol, and n-propanol alcohol flames, to investigate the shapes, structures (i.e., reactants and products zones), kind, and quality of burning in different areas. For this purpose, molecular bands of CH, CH*, C-2, CN, and CO as well as atomic and ionic lines of C, H, N, and O are identified, simultaneously. Experimental results indicate that the CN and C-2 emissions have highest intensity in LIBS spectrum of n-propanol flame and the lowest in methanol. In addition, lowest content of CO pollution and better quality of burning process in n-propanol fuel flame toward ethanol and methanol are confirmed by comparison between their CO molecular band intensities. Moreover, variation of the signal intensity from these three flames with that from a known area of burner plate is compared. Our findings in this research advance the prior results in time-integrated LIBS combustion application and suggesting that LIBS can be used successfully with the CCD detector as a non-gated analytical tool, given its simple instrumentation needs, real-time capability applications of molecular detection in laminar diffusion flame samples, requirements.