Spectroscopic Characterization of Laser Ablated Germanium Plasma

Abstract

In the present study, the germanium (Ge) sample has been studied by laser induced breakdown spectroscopy which leads to the formation of plasma plume in the air. This research work comprises on pure Ge sample, and it has been studied using laser irradiance 1.83x10¹¹ watt.cm^-2
and Q-Switched Nd:YAG laser pulse (λ ~ 1064 nm wavelength and  ~ 5 ns pulse width). The spatially resolved plasma plume parameters are investigated, such as variation of electron temperature T_e and electron number density ne as a function of detector position. These parameters
show variation in the plasma plume and yield electron temperature T_e from 12340 to 7640 ± 1200 K. Whereas electron number density n_e varies from 3.6x10¹⁷ to 1.60x10¹⁷ cm-3 with the change in detector position is moving away from plasma plume from 0 to 3 mm. The results show that
electron temperature T_e and electron number density n_e are estimated from the Boltzmann plot method and by using Lorentzian function at spectral line using FWHM full width at half maximum at 265.11 nm (4p5s ³p2 → 4p^{2 3}p2) wavelength of Ge (I) line, respectively