Femtosecond laser-induced breakdown spectroscopy of sea water


2013

Голик С. С., Ильин А. А.

Статьи в журналах

Spectrochimica Acta - Part B Atomic Spectroscopy

Elsevier

Volume 87, 1 September 2013, Pages 192-197

192-197

3.18

ISSN: 0584-8547

Ilyin, A.A., Golik, S.S. Femtosecond laser-induced breakdown spectroscopy of sea water // Spectrochimica Acta Part B Atomic Spectroscopy Vol. 87, p. 192-197 · June 2013 DOI: 10.1016/j.sab.2013.06.001

The composition of the line and band spectra of the plasma induced by a femtosecond laser pulse on the surface of sea water is determined. The temporal behaviors of the intensity of the continuum and the Ca II, Mg II and Na I lines are investigated. It is shown that the time dependence of the intensity of the Na I line is described by a monoexponential function. The characteristic decay times of the line intensities of Mg II and Na I were used to estimate the three-body recombination times. Using these values, we estimate the electron number density and the feasibility of Local Thermodynamic Equilibrium (LTE) criterion. A method involving excitation rate constants is proposed for the comparison of detection limits. For a plasma generated on a liquid surface, the following relation among detection limits will be obtained: LOD(Na) < LOD(K) < LOD(Ca) < LOD(Al) < LOD(Mg) < LOD(Zn).