Study of matrix effects in laser-induced breakdown spectroscopy by laser defocus and temporal resolution

Abstract

The laser-induced breakdown spectroscopy (LIBS) analysis method displays a significant matrix effects which greatly hinder the application of this technology. Even if the concentration of a certain element is constant,...

Elemental analysis of single ambient aerosol particles using laser-induced breakdown spectroscopy

“…Airborne particles are exceptionally suitable for LIBS analysis because the matrix is gaseous. Because of the low density of the carrier gas, the matrix effects are significantly lower than with the more traditional solid substrates 24 , 25 . However, as LIBS analysis relies on plasma emission induced by a highly focused laser pulse, either the aerosol particle concentration has to be very high 26 or the particles have to be focused 27 – 29 .…”

Filament induced breakdown spectroscopy with enhanced excitations from plasma gratings

“…[7][8][9][10][11] Compared to other analytical techniques, LIBS offers convenient, remote, fast, and reliable in situ measurements of samples. However, traditional nanosecond LIBS technology faces challenges such as high laser power, long pulse duration, and plasma shielding effects, [12][13][14] which somehow limit the sensitivity of spectral detection.…”

Femtosecond laser-induced breakdown spectroscopy by multidimensional plasma grating

“…11 Nevertheless, the long pulse duration inevitably causes detrimental interaction between the ablation and the induced plasma that may bring about plasma shielding effects and accordingly a low signal-to-noise ratio, let alone low reproducibility of nanosecond plasma itself and unavoidable matrix effects during nanosecond laser ablation. [12][13][14] Filament-induced breakdown spectroscopy (FIBS) offers a unique technique to effectively overcome the aforementioned problems, since femtosecond laments used in this technique ablate the sample within ultrashort pulse durations and hence create plasmas free of deteriorating background uorescence. [15][16][17][18][19] In general, femtosecond laments are generated as plasma defocusing owing to femtosecond laser induced multiphoton-ionization (MPI) counterbalances tightly focusing and Kerr self-focusing, which is typically clamped at a peak intensity of $5 Â 10 13 W cm À2 and an electron density below 10 17 cm À3 in air.…”

“…11 Nevertheless, the long pulse duration inevitably causes detrimental interaction between the ablation and the induced plasma that may bring about plasma shielding effects and accordingly a low signal-to-noise ratio, let alone low reproducibility of nanosecond plasma itself and unavoidable matrix effects during nanosecond laser ablation. 12–14…”