The capabilities of filament-induced breakdown spectroscopy for the analysis of the elemental composition of aqueous aerosols were estimated. The diameter of aqueous aerosol droplets in the ...atmosphere was 0.8–2.0 μm. The emission lines of the chemical elements were excited by fi lamentation of femtosecond laser pulses (60 fs, 800 nm, 4.4 mJ) in weak focusing mode by a lens with a focal length of 500 mm. The obtained limits of detection for Al (396.15 nm), Ba (553.35 nm), Ca (422.67 nm), Mg (285.21 nm), Na (588.99 nm), and Mn (403.08 nm) in an aqueous aerosol were 12.1, 41.7, 10.0, 7.3, 0.7, and 32.3 mg/L, respectively.
The dependence of the intensity of Ca (393.3, 396.8, 422.6 nm), Mg (383.6 nm), and Na (589 nm) emission lines on the laser pulse duration in the method of filament-induced breakdown spectroscopy is ...studied. A filament was excited in seawater aerosol droplets 0.8–2 μm in size by laser pulses of 70, 230, 500, and 900 fs duration at a constant pulse energy of 3.0 mJ. The intensities of the emission lines of the elements under study are shown to increase with the laser pulse duration, except for the magnesium line. Optimal laser pulse durations for the excitation of Ca, Mg, and Na lines in seawater aerosol are derived.
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We have obtained limits of detection (LoD) of Al (396.15 nm), Ba (553.35 nm), Ca (422.67 nm), Mg (285.21 nm), Na (588.99 nm) and Mn (403.08 nm) in liquid-droplet aerosol by filament-induced ...spectroscopy (R-FIBS) using ultrashort laser pulses (60 fs, 800 nm, 4.4 mJ). The limit of detection of the Na by emission line (588.99 nm) in a liquid-droplet aerosol was obtained by laser induced breakdown spectroscopy (LIBS) using short laser pulses (7 ns, 1064 nm, 550 mJ). The obtained results were compared within the framework of the methods used.
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The dependence of the limits of detection of Mg, Mn, Sr, Pb, Al, and B in aqueous solutions on the laser pulse repetition rate is studied by femtosecond laser induced breakdown spectroscopy for the ...laser pulse repetition rate from 50 to 1000 Hz. The limit of detection is shown to be the best at a laser pulse repetition rate of 166 Hz for all the elements under study, other experimental conditions being the same.
