Application of a laser produced plasma: Experimental Stark widths of single ionized lead lines

Abstract

The optical emission spectroscopy from laser produced plasma generated by a 10,640 Å radiation, with an irradiance of 1.4 × 10 10 W cm − 2 on several lead targets, in vacuum and in an atmosphere of argon, was recorded and analyzed between 1900 and 7000 Å. The Local Thermodynamic Equilibrium conditions and plasma homogeneity have been checked. Stark widths for 31 lines of Pb II have been measured. These lines measured in this work correspond to the transitions 7s → 6p, n(n = 8, 9, 10)s → 7p, n(n = 7, 8)p → 7s, n(n = 7, 8)p → 6p 2 , n(n = 7, 8)d → 7p, n(n = 5, 6)f → 6d, n(n = 5, 6)f → 6p 2 . The population level distribution and the corresponding temperatures were obtained using Boltzmann plots. The plasma electron densities were determined using well-known Stark broadening parameters of spectral lines. Special attention was dedicated to the possible self-absorption of the different transitions. Temporal evolution of the plasma parameters was studied between 0.1 and 9 μs. Stark broadening parameters of the spectral lines were measured at 2.5 μs where the electron temperature was close to 11,300 K and the electron density to 0.8 × 10 16 cm − 3 . The experimental results obtained have been compared with the experimental and theoretical values given by other authors. A systematic trend of this parameter versus temperature of 4244.9 Å Pb II line has been presented.

Stark widths of several Pb III spectral lines in a laser-induced lead plasma

“…The experimental system has been described in previous papers (Alonso-Medina 1997; Colón et al 1999;AlonsoMedina et al 2001;Colón & Alonso-Medina 2006).…”

“…The interaction of a high-power laser beam with solid samples generates plasmas on the surfaces of the targets with high temperatures and electron densities. From the experimental point of view, LIPs have proved to be a valuable source of spectroscopic data on neutral and ionized species (Irons 1973;Zhao et al 1992;Alonso-Medina 1997;Colón et al 1999;Alonso-Medina & Colón 2000;Alonso-Medina et al 2001;Alonso-Medina et al 2003;Harilal et al 2005;Colón & Alonso-Medina 2006;...).…”

Stark width measurements of Fe II lines with wavelengths in the range 230–260 nm

“…In the recent compilation article by Lesage [4], covering the period 2001-2007, laser-induced plasmas are included among the plasma sources for experimental determination of Stark widths and shifts. Works published later have reported measurements by laser-induced plasma spectroscopy of Stark widths of Ni II [5], Zn II [6], Sn I and Sn II [7], Pb II [8], and Mn I and Mn II [9]. One of the main requirements for accurate measurements of Stark widths is the existence of optically thin conditions, as selfabsorption leads to distortion of the line profiles and over-estimation of the line widths [4,10].…”

Semiempirical model for analysis of inhomogeneous optically thick laser-induced plasmas

“…Many papers have been devoted to plasma characterization in several kinds of samples under different experimental conditions [3][4][5][6][7][8][9][10]. Nevertheless, some concerns may arise in some specific situations.…”